CN105407463B - A kind of wireless sensor network system - Google Patents
A kind of wireless sensor network system Download PDFInfo
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- CN105407463B CN105407463B CN201510900536.3A CN201510900536A CN105407463B CN 105407463 B CN105407463 B CN 105407463B CN 201510900536 A CN201510900536 A CN 201510900536A CN 105407463 B CN105407463 B CN 105407463B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of wireless sensor network system, network manager therein for then downward first device to send a broadcast frame every scheduled duration, and when there are task to be processed, carries out task processing；Sensor node therein, for when being initially received the broadcast frame that upper level equipment is sent, carry out networking processing, after networking successfully, into normal operating conditions circulation pattern, in this mode, when receiving the broadcast frame that upper level equipment is sent every time, time synchronization is then carried out according to the timestamp information carried in the broadcast frame received, and enter dormancy awakening circulation pattern, when waking up as needed from dormant state every time, if desired broadcast frames reception is carried out, then exit dormancy awakening circulation pattern, otherwise, when there are task to be processed, carry out task processing.Using scheme of the present invention, the power consumption etc. of system can reduce.
Description
Technical field
The present invention relates to network technology, in particular to a kind of wireless sensor network system.
Background technique
Wireless sensor network (WSN, Wireless Sensor Network) system is a kind of distributed sensor system
System, its tip is the sensor node that can perceive and check the external world.Sensor in wireless sensor network system
Node wirelessly communicates, therefore network settings are flexible, and device location can be changed at any time, by wireless communication mode shape
At a multihop self-organizing network system.
Currently, wireless sensor network system is in environment sensing and monitoring, wireless location and tracking, medical monitoring and intelligence
The fields such as energy household have all shown broad application prospect.
In existing most of wireless sensor network systems, each equipment is constantly in working condition, so as to cause system
Power consumption is very big.
Summary of the invention
In view of this, can reduce the power consumption etc. of system the present invention provides a kind of wireless sensor network system.
In order to achieve the above object, the technical scheme of the present invention is realized as follows:
A kind of wireless sensor network system, comprising: network manager and sensor node；
Network manager, for then downward first device to send a broadcast frame every scheduled duration, and when existing wait locate
When the task of reason, task processing is carried out；
Sensor node, for carrying out networking processing, entering when being initially received the broadcast frame that upper level equipment is sent
After netting successfully, into normal operating conditions circulation pattern, in this mode, when receive every time upper level equipment send it is wide
It when broadcasting frame, then carries out the following processing: time synchronization being carried out according to the timestamp information carried in the broadcast frame received, and is entered
If desired dormancy awakening circulation pattern carries out broadcast frames reception when waking up as needed from dormant state every time, then exit not
Otherwise dormancy wakeup cycle mode when there are task to be processed, carries out task processing.
As it can be seen that sensor node only wakes up when needed and carries out task processing, Qi Tashi using scheme of the present invention
Between then in a dormant state, without being constantly in working condition, thereby reduce the power consumption etc. of system.
Detailed description of the invention
Fig. 1 is the schematic diagram of star network topology of the present invention.
Fig. 2 is the schematic diagram of tree network topology structure of the present invention.
Fig. 3 is the schematic diagram of chain-shaped network topological structure of the present invention.
Fig. 4 is the schematic diagram of call duration time piece of the present invention and time slot.
Fig. 5 is the operating status machine schematic diagram of repeater of the present invention.
Fig. 6 is the operating status machine schematic diagram of sensor node of the present invention.
Specific embodiment
Aiming at the problems existing in the prior art, a kind of wireless sensor network system is proposed in the present invention, comprising: network
Manager (NM, Network Manager) and sensor node (SN, Sensor Node) in addition can also further comprise: position
Repeater (RP, Repeater) between network manager and sensor node.
Network protocol is based on IEEE Std 802.15.4, completely compatible physical layer protocol, in Medium Access Layer
(MAC, Media Access Control) joined time division multiple acess (TDMA, time division multiple access)
With frequency division multiple access (FDMA, frequency division multiple access) technology, used in multi-stage cascade topology
Slotted channel frequency hopping (TSCH, Time Slotted Channel Hopping) technology, and star-like, tree is supported in network layer
Three kinds of shape, chain network topology structures.Wherein, tree-like and chain-shaped network topological structure, maximum support that cascade number is 15 grades.
Network manager is for monitoring and managing network performance and data forwarding to primary application program (such as PC machine, service
Device, cloud etc.)；Repeater is used to forward the uplink and downlink data etc. between network manager and sensor node, supports TSCH mould
Formula；Sensor node is used for the acquisition (such as acceleration, pressure, temperature, voltage, electric current) of data, and will by Radio Link
Required data are transmitted to primary application program etc..
When only including network manager and sensor node in wireless sensor network system, Star Network is generallyd use
Topological structure, as shown in FIG. 1, FIG. 1 is the schematic diagrames of star network topology of the present invention.
When including simultaneously network manager, repeater and sensor node in wireless sensor network system, usually adopt
With tree network topology structure or chain-shaped network topological structure, as shown in figures 2-3, Fig. 2 is tree network topology of the present invention
The schematic diagram of structure, Fig. 3 are the schematic diagram of chain-shaped network topological structure of the present invention.
In Fig. 1~3, triangle indicates network manager, and circle indicates repeater, and rectangle indicates sensor node, empty
Line indicates Radio Link.
Specifically, network manager, for every scheduled duration, then downward first device to send a broadcast frame, and when depositing
In task to be processed, task processing is carried out.
Sensor node, for carrying out networking processing, entering when being initially received the broadcast frame that upper level equipment is sent
After netting successfully, into normal operating conditions circulation pattern, in this mode, when receive every time upper level equipment send it is wide
It when broadcasting frame, then carries out the following processing: time synchronization being carried out according to the timestamp information carried in the broadcast frame received, and is entered
If desired dormancy awakening circulation pattern carries out broadcast frames reception when waking up as needed from dormant state every time, then exit not
Otherwise dormancy wakeup cycle mode when there are task to be processed, carries out task processing.
Repeater, for when being initially received the broadcast frame that upper level equipment is sent, carrying out networking processing, network at
After function, into normal operating conditions circulation pattern, in this mode, when the broadcast frame for receiving upper level equipment every time and sending
When, then it carries out the following processing: time synchronization is carried out according to the timestamp information that carries in the broadcast frame received, and to next stage
Equipment sends broadcast frame, enters dormancy awakening circulation pattern later, when waking up as needed from dormant state every time, if desired
Broadcast frames reception is carried out, then exits dormancy awakening circulation pattern, otherwise, when there are task to be processed, carries out task processing.
Can include using above-mentioned scheduled duration as a call duration time piece, in each call duration time piece the essential time slot of four classes and
A kind of optional time slot, essential time slot includes: to broadcast frame slot, general communication time slot, response time slot and equipment access slot, optional
Time slot includes: specific communication time slot.
Frame slot is broadcasted, sends broadcast frame for network manager；
Specific communication time slot sends broadcast frame for repeater, i.e., uses when sending broadcast frame for cascade repeater,
Since repeater supports TSCH mode, it can be multiplexed the time slot by the way that different down channel is arranged, it when needed, can be with
By artificial or software configuration, general communication time slot is set by specific communication time slot；
General communication time slot is transmitted for uplink and downlink data, i.e., for network manager and repeater and repeater and
Uplink and downlink data transmission between sensor node；
Response time slot is transmitted for acknowledgement frame, i.e., for successfully carrying out response, network management to whether upstream data receives
Device and repeater can send after receiving the data acknowledgement frame carry out response, repeater and sensor node send data it
After open this time slot receive acknowledgement frame to determine whether needing to retransmit a data packet；
Equipment access slot, the networking for equipment access, that is, are used to use when equipment network, which can be used the free time
Channel estimating (CCA, Clear Channel Assessment) technology guarantees the quick and reliability of networking.
It include 62 time slots in each call duration time piece preferably, the when a length of 125ms of each call duration time piece, point
Not Wei time slot 1~62, as shown in figure 4, Fig. 4 is the schematic diagram of call duration time piece of the present invention and time slot.
The details of each time slot in each call duration time piece can be as follows:
| Time slot | Absolute time in 125ms | Description | Explanation |
| 1 | 0-2 | Broadcast frame slot | Continue 2ms |
| 2-16 | 2-32 | Specific communication time slot | Continue 30ms |
| 2-58 | 32-116 | General communication time slot | Continue 84ms |
| 59 | 116-118 | Response time slot 1 | Continue 2ms |
| 60 | 118-120 | Response time slot 2 | Continue 2ms |
| 61 | 120-122 | Response time slot 3 | Continue 2ms |
| 62 | 122-125 | Equipment access slot | Continue 3ms |
Each time slot details in each call duration time piece of table one
As shown above,
Time slot 1 is broadcast frame slot；
Time slot 59~61 is response time slot；
Time slot 62 is equipment access slot；
When there are specific communication time slot, time slot 2~16 is specific communication time slot, when time slot 17~58 is general communication
Gap；
When not depositing specific communication time slot, time slot 2~58 is general communication time slot.
A network manager is included at least in entire wireless sensor network system, which sends one every 125ms
Secondary broadcast frame, the maintaining of the time synchronization of entire wireless sensor network system, the transmission of down order and network state
Instruction and control etc. are completed by broadcast frame mechanism.
The composed structure of broadcast frame can be as follows:
| Frame head | Frame state | Timestamp | Downlink wake-up device address (≤5) | Check bit |
The composed structure of two broadcast frame of table
It as shown above, include frame head, frame state, timestamp, downlink wake-up device address, check bit in broadcast frame；
Frame head: it is used to indicate communication frame and starts；
Frame state: for network instruction and control (such as again networking, broadcast frame depth levels)；
Timestamp: the network time of wireless sensor network system is used for time synchronization；
Downlink wake-up device address: notice equipment has down order, needs to wake up in the time slot for itself corresponding to (oneself is exclusive)
Come；
Check bit: it is used for frame check, guarantees the integrality and authenticity of data.
As previously mentioned, network manager, repeater and sensor node need to carry out respective task processing respectively.
Wherein, the task of network manager processing can include: send downlink data, receive upstream data and (and located
Reason), send acknowledgement frame and processing network request.
The task of sensor node processes can include: receive downlink data (and processing), send upstream data and connect
It receives acknowledgement frame (and processing).
The task of repeater processing can include: receive downlink data (and processing), send downlink data, receive uplink
Data (and processing) send upstream data, receive acknowledgement frame (and processing), sending acknowledgement frame and handle to network and ask
It asks.
For repeater or sensor node, when needing to carry out upstream data transmission, utilization is preset, itself is right
The general communication time slot answered carries out data transmission.
For network manager or repeater, when needing to carry out downlink data transmission, utilization is preset, recipient
Corresponding general communication time slot carries out data transmission.
Each repeater and the corresponding general communication timeslot number of sensor node are one or are greater than one, and support dynamic
Adjustment.
Based on foregoing description, sensor node and repeater be can be further used for, and wake up from dormant state, are initially received
After the broadcast frame sent to upper level equipment, it is again introduced into dormant state, and wake up in equipment access slot, determination is set in advance
Whether the fixed communication channel communicated with upper level equipment is idle, if so, first device sends the request that networks upwards, if
No, then carrying out the time keeps out of the way, if channel idle after keeping out of the way, upward first device sends the request that networks, if after keeping out of the way still
Not idle, then the progress time keeps out of the way again, keeps out of the way number until keeping out of the way number and reaching preset maximum；After networking successfully,
Network parameter configuration is carried out according to the network parameter got, enters normal operating conditions circulation pattern later.
In addition, repeater can be further used for, when being in normal operating conditions circulation pattern, if receiving broadcast
Frame is then switched to progress broadcast frame transmission in the preset communication channel communicated with next stage equipment.
Repeater can be further used for, and when carrying out task processing, is if desired communicated, then cut with upper level equipment
Change in the preset communication channel communicated with upper level equipment progress task processing, if desired with next stage equipment
It is communicated, is then switched to progress task processing in the preset communication channel communicated with next stage equipment.
Further more, repeater and sensor node can be further used for, when being in normal operating conditions circulation pattern, if
It is more than that maximum time of losing lock does not receive broadcast frame yet from initially receiving, then exits normal operating conditions circulation pattern.
In summary it introduces, the operating status machine that network manager can be obtained is as follows:
Network manager is constantly in working condition, i.e. not suspend mode always, sends a broadcast frame every 125ms, and work as
When thering is task to be handled, real-time perfoming processing, comprising:
Downlink data is sent, for example, network manager needs to send downlink data to a certain repeater of next stage, then
Then the downlink data is sent in the corresponding general communication time slot of the repeater；
It receives upstream data and is sent to primary application program, such as PC machine, server, cloud；
Acknowledgement frame is sent, can specifically be preset using which response frame slot to send acknowledgement frame；
Processing, which networks, requests, i.e., handles the networking request received, how to handle as the prior art.
Fig. 5 is the operating status machine schematic diagram of repeater of the present invention.
As shown in figure 5, mainly including following two parts:
1) repeater suspend mode timing wake-up, wakes up from dormant state, is initially received the broadcast that upper level equipment is sent
After frame, it is again introduced into dormant state, and wake up in equipment access slot, determines and preset communicated with upper level equipment
Communication channel it is whether idle, if so, upwards first device send network request, keep out of the way if it is not, then carrying out the time, if keeping out of the way
Channel idle later, then upward first device sends the request that networks, if still not idle after keeping out of the way, the progress time is moved back again
It keeps away, keeps out of the way number until keeping out of the way number and reaching preset maximum, after reaching maximum and keeping out of the way number, waiting is broadcasted next time
The reception of frame；After networking successfully, network parameter configuration is carried out according to the network parameter got, enters normal operating conditions later
Circulation pattern.
2) when being in normal operating conditions circulation pattern, if being more than that maximum time of losing lock does not receive yet from initially receiving
To broadcast frame, then normal operating conditions circulation pattern is exited；
When being in normal operating conditions circulation pattern, if receiving broadcast frame every time, according to the broadcast frame received
The timestamp information of middle carrying carries out time synchronization, and is switched to the preset communication letter communicated with next stage equipment
Broadcast frame transmission is carried out on road, enters dormancy awakening circulation pattern later；
When being in dormancy awakening circulation pattern, when waking up as needed from dormant state every time, if desired carry out wide
It broadcasts frame to receive (i.e. in reception broadcast frame slot), then dormancy awakening circulation pattern is exited, otherwise, when there are tasks to be processed
When, carry out task processing, wherein if desired communicated with upper level equipment, be then switched to and preset set with upper level
Task processing is carried out in the standby communication channel communicated, is if desired communicated with next stage equipment, is then switched to and sets in advance
Task processing is carried out in the fixed communication channel communicated with next stage equipment；
Task processing include: receive downlink data, send downlink data, receive upstream data, send upstream data,
It receives acknowledgement frame, send acknowledgement frame and processing networking request.
Repeater when need to wake up can according to the actual situation depending on, for example, repeater is according in the broadcast frame received
The downlink wake-up device address of carrying knows that network manager needs to issue data to itself, then then can be corresponding often at itself
Rule communication time slot is waken up, and to receive downlink data, for another example, repeater is able to know that next stage sensor node is corresponding in advance
General communication time slot, then can wake up in the time slot, to check whether sensor node can send upstream data etc..
Fig. 6 is the operating status machine schematic diagram of sensor node of the present invention.
As shown in fig. 6, mainly including following two parts:
1) sensor node dormancy timing wake-up is waken up from dormant state, is initially received what upper level equipment was sent
After broadcast frame, it is again introduced into dormant state, and wake up in equipment access slot, determines that preset and upper level equipment carries out
Whether the communication channel of communication is idle, if so, first device sends the request that networks upwards, keeps out of the way if it is not, then carrying out the time, if
Channel idle after keeping out of the way, then upward first device sends the request that networks, if still not idle after keeping out of the way, carries out the time again
Keep out of the way, keep out of the way number until keeping out of the way number and reaching preset maximum, after reaching maximum and keeping out of the way number, waits next time wide
Broadcast the reception of frame；After networking successfully, network parameter configuration is carried out according to the network parameter got, enters work normally shape later
State circulation pattern.
2) when being in normal operating conditions circulation pattern, if being more than that maximum time of losing lock does not receive yet from initially receiving
To broadcast frame, then normal operating conditions circulation pattern is exited；
When being in normal operating conditions circulation pattern, if receiving broadcast frame every time, according to the broadcast frame received
The timestamp information of middle carrying carries out time synchronization, and enters dormancy awakening circulation pattern；
When being in dormancy awakening circulation pattern, when waking up as needed from dormant state every time, if desired carry out wide
Frame reception is broadcast, then exits dormancy awakening circulation pattern, otherwise, when there are task to be processed, carries out task processing, comprising:
Downlink data is received, upstream data is sent and receives acknowledgement frame.
In short, sensor node and repeater can only wake up when needed and carry out task using scheme of the present invention
Processing, other time then in a dormant state, without being constantly in working condition, thereby reduce the power consumption of system.
Moreover, the real-time and bandwidth of system can be guaranteed well using scheme of the present invention: on can guarantee
It is 125ms that the response time of downlink data is most short, and each repeater can realize that more equipment divide channel with time slot on the basis of FDMA
Transmission, to ensure that communication bandwidth and communication quality to the greatest extent, further, it is also possible to which the agreement by network manager is secondary
Cut out Processing Algorithm etc., for the multiple time slots of sensor node of system distribution for needing larger data to upload in the short time, this for acceleration,
The scene of some larger sample rate applications such as dynamic strain is of great significance, in addition, repeater or sensor node can also
To complete the downloading of itself firmware by the application of this multi-slot, final to realize radio firmware upgrade function, this is that product exists
With the technology of core competitive power in practical application.
Further more, using scheme of the present invention, it can be achieved that the packet-switching of zero conflict, the whole network time synchronization etc., and can
It supports a variety of different network topology structures, there is broad applicability etc..
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (9)
1. a kind of wireless sensor network system characterized by comprising network manager and sensor node；
Network manager, for then downward first device to send a broadcast frame every scheduled duration, and when there are to be processed
When task, task processing is carried out；
Sensor node, for when being initially received the broadcast frame that upper level equipment is sent, carrying out networking processing, network at
After function, into normal operating conditions circulation pattern, in this mode, when the broadcast frame for receiving upper level equipment every time and sending
When, then it carries out the following processing: time synchronization being carried out according to the timestamp information carried in the broadcast frame received, and enters suspend mode
If desired wakeup cycle mode carries out broadcast frames reception when waking up as needed from dormant state every time, then exit suspend mode and call out
Otherwise circulation pattern of waking up when there are task to be processed, carries out task processing；
The system further comprises: the repeater between network manager and sensor node；
Repeater, for carrying out networking processing, networking successfully when being initially received the broadcast frame that upper level equipment is sent
Afterwards, into normal operating conditions circulation pattern, in this mode, when the broadcast frame for receiving upper level equipment every time and sending
When, then it carries out the following processing: time synchronization is carried out according to the timestamp information that carries in the broadcast frame received, and to next stage
Equipment sends broadcast frame, enters dormancy awakening circulation pattern later, when waking up as needed from dormant state every time, if desired
Broadcast frames reception is carried out, then exits dormancy awakening circulation pattern, otherwise, when there are task to be processed, carries out task processing.
2. system according to claim 1, which is characterized in that
It is in star network topology between network manager and sensor node.
3. system according to claim 1, which is characterized in that
It is in tree network topology structure or chain-shaped network topological structure between network manager, repeater and sensor node.
4. system according to claim 1, which is characterized in that
Using the scheduled duration as a call duration time piece, including the essential time slot of four classes and one kind in each call duration time piece can
Time slot is selected, essential time slot includes: broadcast frame slot, general communication time slot, response time slot and equipment access slot, optional time slot packet
It includes: specific communication time slot；
Frame slot is broadcasted, sends broadcast frame for network manager；
Specific communication time slot sends broadcast frame for repeater；
General communication time slot is transmitted for uplink and downlink data；
Response time slot is transmitted for acknowledgement frame；
Equipment access slot, the networking for equipment access；
The task of network manager processing includes: to send downlink data, receive upstream data, send acknowledgement frame and handle to network and ask
It asks；
The task of sensor node processes includes: to receive downlink data, send upstream data and receive acknowledgement frame；
Repeater processing task include: receive downlink data, send downlink data, receive upstream data, send upstream data,
It receives acknowledgement frame, send acknowledgement frame and processing networking request.
5. system according to claim 4, which is characterized in that
The when a length of 125ms of each call duration time piece；
It include 62 time slots, respectively time slot 1~62 in each call duration time piece；
Time slot 1 is broadcast frame slot；
Time slot 59~61 is response time slot；
Time slot 62 is equipment access slot；
When there are specific communication time slot, time slot 2~16 is specific communication time slot, and time slot 17~58 is general communication time slot；
When not depositing specific communication time slot, time slot 2~58 is general communication time slot.
6. system according to claim 4 or 5, which is characterized in that
For repeater or sensor node, when needing to carry out upstream data transmission, utilization is preset, itself is corresponding
General communication time slot carries out data transmission；
For network manager or repeater, when needing to carry out downlink data transmission, utilization is preset, recipient is corresponding
General communication time slot carry out data transmission；
Each repeater and the corresponding general communication timeslot number of sensor node are one or are greater than one, and dynamic is supported to adjust
It is whole.
7. system according to claim 4 or 5, which is characterized in that
Sensor node and repeater are further used for, and wake up from dormant state, are initially received what upper level equipment was sent
After broadcast frame, it is again introduced into dormant state, and wake up in equipment access slot, determines that preset and upper level equipment carries out
Whether the communication channel of communication is idle, if so, first device sends the request that networks upwards, keeps out of the way if it is not, then carrying out the time, if
Channel idle after keeping out of the way, then upward first device sends the request that networks, if still not idle after keeping out of the way, carries out the time again
Keep out of the way, keeps out of the way number until keeping out of the way number and reaching preset maximum；After networking successfully, according to the network parameter got into
The configuration of row network parameter, enters normal operating conditions circulation pattern later.
8. system according to claim 7, which is characterized in that
Repeater is further used for, and when being in normal operating conditions circulation pattern, if receiving broadcast frame, is switched in advance
Broadcast frame transmission is carried out in the communication channel of setting communicated with next stage equipment；
Repeater is further used for, and when carrying out task processing, is if desired communicated with upper level equipment, then is switched in advance
Task processing is carried out in the communication channel of setting communicated with upper level equipment, is if desired led to next stage equipment
Letter is then switched to progress task processing in the preset communication channel communicated with next stage equipment.
9. system according to claim 1, which is characterized in that
Repeater and sensor node are further used for, when being in normal operating conditions circulation pattern, if from initially receiving
Broadcast frame is not received yet more than maximum time of losing lock, then exits normal operating conditions circulation pattern.
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| CN101459978A (en) * | 2008-12-05 | 2009-06-17 | 浙江大学 | Data collection transmission reliable guarantee method in wireless sensor network |
| CN102404817A (en) * | 2011-10-25 | 2012-04-04 | 中国科学院计算技术研究所 | Networking method and system for wireless sensor network based on multiple sink nodes |
| CN102693644A (en) * | 2012-05-29 | 2012-09-26 | 杭州快泊信息技术有限公司 | Parking lot vacancy information collecting method based on wireless sensor network |
| CN102869124A (en) * | 2012-10-09 | 2013-01-09 | 深圳市翌日科技有限公司 | Wireless data transmission system and method |
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| CN101459978A (en) * | 2008-12-05 | 2009-06-17 | 浙江大学 | Data collection transmission reliable guarantee method in wireless sensor network |
| CN102404817A (en) * | 2011-10-25 | 2012-04-04 | 中国科学院计算技术研究所 | Networking method and system for wireless sensor network based on multiple sink nodes |
| CN102693644A (en) * | 2012-05-29 | 2012-09-26 | 杭州快泊信息技术有限公司 | Parking lot vacancy information collecting method based on wireless sensor network |
| CN102869124A (en) * | 2012-10-09 | 2013-01-09 | 深圳市翌日科技有限公司 | Wireless data transmission system and method |
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