CN103997766B - A kind of wireless multimedia sensor network channel scanning method of low energy consumption - Google Patents
A kind of wireless multimedia sensor network channel scanning method of low energy consumption Download PDFInfo
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- CN103997766B CN103997766B CN201410113022.9A CN201410113022A CN103997766B CN 103997766 B CN103997766 B CN 103997766B CN 201410113022 A CN201410113022 A CN 201410113022A CN 103997766 B CN103997766 B CN 103997766B
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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
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- 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
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Abstract
The wireless multimedia sensor network channel scanning method of the low energy consumption of the present invention, including：Terminal node and routing node first determine whether whether the last preferred channels used are current still optimal；If being no longer optimal, terminal node chooses two numerically closest channels of two preferred channels used with oneself last time from other terminal nodes；Routing node is from choosing two two closest channels of the optimal letter used with oneself last time in oneself having other routing nodes of same superior node；Channel between two channels of selection is scanned, the channel with minimum channel energy is chosen.To using for multi channel wireless multimedia sensor network, because terminal node and routing node to channel all in channel space it is determined that no longer gradually scan during preferred channels, seldom a part of channel only need to be scanned, the energy expenditure of network node can be efficiently reduced, reduce the transmission delay of multi-medium data, the utilization ratio for the energy consumption that network node scanning channel is used is also improved, and then improves the service life of network node.
Description
Technical field
The present invention relates to a kind of wireless multimedia sensor network channel scanning method of low energy consumption, in particular, especially
It is related to a kind of channel selecting method of wireless multimedia sensor network.
Background technology
Wireless multimedia sensor network is a technology branch of traditional wireless sensor network, is wirelessly to pass
A kind of cordless communication network technology for being gathered in sensor network and transmitting the actual demands of multi-medium data such as audio frequency and video and producing.
The wireless terminal node of connection microphone or camera is deployed in the place for needing to monitor discretely, in a distributed manner, is monitored
Audio and video data streams pass to Centroid by the way of wireless, multi-hop, so as to realize to monitoring place multi-medium data
Collection and the purpose that is wirelessly transferred.
What is transmitted due to wireless multimedia sensor network is the multi-medium datas such as audio frequency and video, therefore the data traffic of network
It is more much greater than traditional wireless sensor network, and then the network energy consumed is also bigger than traditional wireless sensor network very
It is many.Therefore in order to extend the service life of network node, the requirement to the energy-saving effect of network node is also especially harsh.It is wireless many
The energy consumption of media sensor network node is related to perhaps many technology contents, and we are only from raising network node energy-consumption here
Utilization ratio in terms of studied.
Because wireless channel scanning is the operation that wireless multimedia sensor network node compares power consumption, thus here we
Wireless channel scanning technology to wireless multimedia sensor network does particular study, finds the scanning efficient energy of wireless channel
Application way is consumed, so as to reduce the energy consumption of wireless multimedia sensor network node, and then the service life of network node is improved.
Current international achievement in research studies the scan method of wireless channel primarily directed to wlan network, it is therefore an objective to reduce movement
Platform is in switching access point（AP）During time for consuming, so as to improve the QoS of wlan network（Service quality）.The side of use
Method mainly has：Group scan method, network topology assist in scanning method and selective channel scan method etc. are several.Group channel
Scan method is that the multiple mobile stations for switching access point will be needed to constitute each mobile station in a group, this group to disperse
Multiple wireless channels of neighboring access point are scanned likes, are then shared channel scan results in group, so as to realize to phase
The fast channel scan of adjacent access point.The channel scanning method that network topology is assisted is the side of the network topology using neighbor node
Help to reduce the time of wireless channel scanning, so as to realize being switched fast for wlan network access point.Selective channel scanning side
Method is mobile station only to neighbor picture（NG）The wireless channel of determination is scanned, and is scanned so as to reduce in access point handoff procedure
Wireless channel quantity, and then time for needing during switching access point is reduced, so as to improve wlan network
QoS。
But, all these methods are switched fast just for wireless channel, for the purpose of the QoS for improving network, and
The energy that mobile station is consumed in the scanning process of wireless channel is not accounted for, mobile station is not more studied in wireless channel scanning
During how to improve the utilization ratio of finite energy, therefore be not suitable for the use of wireless multimedia sensor network.
The content of the invention
The present invention is in order to overcome the shortcoming of above-mentioned technical problem there is provided a kind of wireless multimedia sensor net of low energy consumption
Network channel scanning method.
The wireless multimedia sensor network channel scanning method of the low energy consumption of the present invention, it is particular in that, including
Following steps：A) network designs, lay and set up the wireless multimedia sensor net of the tree topology of multichannel communication
Network, it is made up of terminal node, routing node and Centroid；B) judgement of terminal nodes preferred channels, terminal node is in hair
Send before multi-medium data, first judge whether the last preferred channels used during multi-medium data that send are current still optimal, such as
It is really or optimal, it is maintained for preferred channels constant；If the current channel that last time transmission data are used has not been optimal, lead to
Cross step c) and choose preferred channels again；C) selection again of terminal nodes preferred channels, terminal node from other terminal sections
Two numerically closest channels of two preferred channels used with oneself last time are selected in the preferred channels of point,
And all channels between two selected channels are scanned successively, channel of the selection with minimum channel energy is used as the end
The current preferred channels of end node；D) judgement of routing nodes preferred channels, routing node is before repeating multimedia data, first
Judge whether the last preferred channels used during multi-medium data that send are current still optimal, if still optimal, are maintained for
Preferred channels are constant；If the preferred channels that last time transmission data are used have not been currently optimal, by step e) again
Choose preferred channels；E) selection again of routing nodes preferred channels, routing node is from oneself having same superior node
Other routing nodes preferred channels in select two preferred channels used with oneself last time and numerically connect the most
Two near channels, and all channels between two selected channels are scanned successively, selection has minimum channel energy
Channel be used as the current preferred channels of the routing node.
The wireless multimedia sensor network channel scanning method of the low energy consumption of the present invention, the optimal letter of step b) terminal nodes
In the judgement in road and the deterministic process of step d) routing node preferred channels, if the last multi-medium data that sends is used most
The channel energy of excellent channel is less than threshold value set in advance, then it is assumed that the preferred channels that the last time uses still are current
Preferred channels；If the last time sends the channel energy for the preferred channels that multi-medium data is used more than or equal to set in advance
Threshold value, then it is assumed that the preferred channels that the last time uses have not been current preferred channels.
The wireless multimedia sensor network channel scanning method of the low energy consumption of the present invention, the terminal node described in step c)
The selection again of preferred channels is realized by following steps：C-1) two selections closest to channel of, terminal node is according to it
Last time sends preferred channels used in data, and two are selected from the preferred channels of other terminal nodes made with oneself last time
Two numerically closest channels of preferred channels, if two channels chosen are followed successively by ch_e_up, ch_f_up,
Its scan channel constituted interval is [ch_e_up, ch_f_up]；C-2) chooses the channel less than threshold value, to channel region
Between the channel energy of [ch_e_up, ch_f_up] interior channel judged successively, set in advance if the channel energy of channel is less than
Fixed threshold value, then it may be preferred channels to show the channel, preserve the channel number and channel energy of the channel；If channel
Channel energy be more than or equal to setting threshold value, the channel is not involved in the selection of preferred channels；C-3) whether all channels of
Judgement is finished, and judges whether channels all in channel interval [ch_e_up, ch_f_up] have judged to finish, if sentenced
It is disconnected to finish, then perform step c-4)；If not judging to finish, step c-2 is performed)；C-4) the selection of preferred channels, than
Compared with step c-2) in all eligible channels channel energy size, choose minimum channel energy corresponding to channel conduct
The current preferred channels of the terminal node；C-5) the broadcast of preferred channels, terminal node is chosen after preferred channels, by selection
Preferred channels are broadcast to other terminal nodes.
The wireless multimedia sensor network channel scanning method of the low energy consumption of the present invention, the routing node described in step e)
The selection again of preferred channels is realized by following steps：E-1) two selections closest to channel of, routing node is according to it
Preferred channels used in last time forwarding data, from oneself having the preferred channels of other routing nodes of same superior node
In select two numerically closest channels of two preferred channels used with oneself last time, if choose two letter
Road is followed successively by ch_m_up, ch_n_up, and its scan channel constituted interval is [ch_m_up, ch_n_up]；E-2) chooses low
In the channel of threshold value, the channel energy to interval [ch_m_up, ch_n_up] the interior channel of channel is judged successively, if letter
The channel energy in road is less than threshold value set in advance, then it may be preferred channels to show the channel, preserve the letter of the channel
Taoist monastic name and channel energy；If the channel energy of channel is more than or equal to threshold value set in advance, the channel is not involved in most
The selection of excellent channel；E-3) whether all channels of judge to finish, and judge all in channel interval [ch_m_up, ch_n_up]
Whether channel, which has judged, finishes, if having judged to finish, and performs step e-4)；If not judging to finish, perform
Step e-2)；E-4) selection of preferred channels, comparison step e-2) in all eligible channels channel energy size,
Choose the channel corresponding to minimum channel energy and be used as the current preferred channels of the routing node；E-5) the broadcast of preferred channels,
Routing node is chosen after preferred channels, and the preferred channels of selection are broadcast to oneself having other roads of same superior node
By node.
The wireless multimedia sensor network channel scanning method of the low energy consumption of the present invention, if wireless multimedia sensor net
After the terminal node of network, routing node and Centroid deployment are finished, channel energy is most when not transmitting data for all channels
It is small value be a, transmit data when channel energy maximum, minimum value be respectively b,, then threshold value is setMeet and close
It is formula：A ＜＜＜ b.
The beneficial effects of the invention are as follows：The wireless multimedia sensor network channel scanning method of the low energy consumption of the present invention,
First determine whether whether channel used in last time transmission data is still optimal, then keep channel constant if optimal, only exist
In the case of not being preferred channels, the selection again of preferred channels is just carried out, consuming energy, taking when channel is chosen has been saved；Eventually
End node and routing node are during the selection of preferred channels, with two letters closest with the preferred channels of its last time
Interval between road is sweep interval, for the wireless multimedia sensor network using multichannel mode networking, each whole
End node or routing node it is determined that transmitting multimedia data use preferred channels when without to all in channel space
Channel is all scanned, and only seldom a part of wireless channel need to be scanned, so as to reduce the transmission of multi-medium data
Delay, simultaneously because needing the wireless channel quantity scanned to decline to a great extent, therefore can also reduce the energy expenditure of network node,
The utilization ratio of network node energy-consumption is improved, and then improves the service life of network.
Terminal node and routing node are during the selection again of preferred channels, by by the channel energy of channel and in advance
The threshold value first setIt is compared, the stronger channel bank of the channel being occupied by other nodes at present, external interference can be removed
Outside, by regarding the minimum channel of channel energy as preferred channels, it is ensured that radio multimedium data stabilization, reliably pass
It is defeated.
Brief description of the drawings
Fig. 1 is the schematic diagram of the wireless multimedia sensor network of the present invention；
Fig. 2 is the schematic diagram of the sweep interval of routing nodes of the present invention；
Fig. 3 is the schematic diagram of the sweep interval of terminal node in the present invention；
Fig. 4 is the span schematic diagram of threshold value set in advance in the present invention；
The flow chart that Fig. 5 scans for terminal node preferred channels in the present invention；
Fig. 6 is the flow chart that routing nodes preferred channels of the present invention are scanned.
In figure：First, terminal node, two, routing node, three, Centroid, four, multi-medium data collection sensor, five,
Upper PC.
Embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
The wireless multimedia sensor network channel scanning method of the low energy consumption of the present invention, comprises the following steps：
A) network designs, lay and set up the wireless multimedia sensor network of the tree topology of multichannel communication,
It is made up of terminal node 1, routing node 2 and Centroid 3；
As shown in figure 1, giving the schematic diagram of the wireless multimedia sensor network of the present invention, multi-medium data collection is passed
Sensor（Four）Transmitted for the video or audio signal of collection site, and by audio, video data to terminal node 1, terminal node
1 is uploaded to data in Centroid 22 by routing node 15 and routing node 20, the most multimedia number at last of Centroid 22
According to being uploaded to upper PC（Five）.Terminal node 1 gathers sensor with wired form and multi-medium data（Four）It is connected, eventually
End node（One）, routing node（Two）And Centroid（Three）Between by wirelessly transmitting data, Centroid 22 with it is upper
PC（Five）It is connected with wired forms.
B) judgement of terminal nodes preferred channels, terminal node judges last send before multi-medium data is sent, first
Whether the preferred channels used during multi-medium data are current still optimal, if still optimal, are maintained for preferred channels constant；Such as
The current channel that the last transmission data of fruit are used has not been optimal, then chooses preferred channels again by step c)；
First determine whether whether the last channel used is current still optimal, is effectively simplified the selection of preferred channels
Journey, the consumption of energy and time-consuming when reducing terminal node scan channel.
C) selection again of terminal nodes preferred channels, terminal node is chosen from the preferred channels of other terminal nodes
Go out two numerically closest channels of two preferred channels used with oneself last time, and to two selected letters
All channels between road are scanned successively, and channel of the selection with minimum channel energy is used as the current optimal letter of the terminal node
Road；
As shown in figure 5, give the flow chart that terminal node preferred channels in the present invention are scanned, the step can by with
Lower method is realized：
C-1) two selections closest to channel of, terminal node preferred channels according to used in its last time sends data,
Two preferred channels used with oneself last time are selected from the preferred channels of other terminal nodes numerically closest
Two channels, if choose two channels be followed successively by ch_e_up, ch_f_up, its scan channel constituted interval be [ch_
E_up, ch_f_up]；
In Fig. 1, if terminal node 2 carries out the scanning of preferred channels, if the preferred channels that the last time of terminal node 2 uses
For ch_j_up, the currently used preferred channels of terminal node 1,3 are respectively ch_e_up, ch_f_up, ch_x_up, ch_y_up
For the minimum value and maximum of all terminal node preferred channels.Terminal node 2 by by other terminal nodes 1,3,4,5,6,
7th, 8,9,10,11,12,13 preferred channels find node 1,3 compared with the preferred channels ch_j_up of first use thereon
Preferred channels ch_e_up, ch_f_up it is numerically closest with ch_j_up, then will choose [ch_e_up, ch_f_
Up] be current preferred channels sweep interval.
C-2) chooses the channel less than threshold value, to the channel energy of interval [ch_e_up, ch_f_up] the interior channel of channel
Judged successively, if the channel energy of channel is less than threshold value set in advance, then it may be optimal to show the channel
Channel, preserves the channel number and channel energy of the channel；If the channel energy of channel is more than or equal to thresholding set in advance
Value, the channel is not involved in the selection of preferred channels；
During terminal node is scanned successively to the channel in channel interval [ch_e_up, ch_f_up], if with
Pointer_ch is pointer, and pointer pointer_ch is initially directed to channel ch_e_up, and judges that channel ch_e_up energy is
It is no to be less than threshold value set in advance, judge to finish backpointer, pointer_ch adds 1, interval to channel successively [ch_e_up,
Ch_f_up] in other channels judged；And by judging whether the sensing of pointer_ch pointers has pointed to channel ch_
F_up judges whether the channel in channel interval [ch_e_up, ch_f_up] is scanned.
As shown in figure 4, giving threshold value set in advance in the present inventionSpan schematic diagram, due to wireless many
The application scenario of media sensor network is different, and the interference that its channel used is subject to can also be differed；Work as radio multimedia sensor
After terminal node 2, routing node 2 and the deployment of Centroid 3 of device network are finished, by detection, if channel is not transmitting data
When channel energy minimum value be a, transmit data when channel energy maximum, minimum value be respectively b,, then set in advance
Fixed threshold valueMeet relational expression：A ＜＜＜ b.Set threshold value＞ a, it is to avoid will during screening
All channels foreclose；Set threshold value＜, turn avoid falsely dropping for occupied channel.
C-3) whether all channels of judge to finish, and judge that channels all in channel interval [ch_e_up, ch_f_up] are
It is no to have judged to finish, if having judged to finish, perform step c-4)；If not judging to finish, step c- is performed
2)；
C-4) selection of preferred channels, comparison step c-2) in all qualified channels channel energy size,
Choose the channel corresponding to minimum channel energy and be used as the current preferred channels of the terminal node；
Channel energy is minimum, illustrates that the external interference that it is subject to is minimum, and channel " most clean " is currently most suitable for transmitting number
According to.
C-5) the broadcast of preferred channels, terminal node is chosen after preferred channels, the preferred channels of selection is broadcast to other
Terminal node.
After the preferred channels of a certain terminal node change, it is informed by way of broadcast to other terminal sections
Point.
D) judgement of routing nodes preferred channels, routing node judges last send before repeating multimedia data, first
Whether the preferred channels used during multi-medium data are current still optimal, if still optimal, are maintained for preferred channels constant；Such as
The current preferred channels that the last transmission data of fruit are used have not been optimal, then choose preferred channels again by step e)；
When routing node first determines whether that its last time forwards data, whether used preferred channels are still optimal, if
Optimal, the scanning without carrying out other channels again effectively reduces the energy consumed during routing node scan channel, and
Also ensure the real-time of audio, video data transmission.
E) selection again of routing nodes preferred channels, routing node from oneself have same superior node its
Two preferred channels used with oneself last time are selected in the preferred channels of its routing node numerically closest
Two channels, and all channels between two selected channels are scanned successively, letter of the selection with minimum channel energy
Road is used as the current preferred channels of the routing node.
As shown in fig. 6, give the flow chart of routing nodes preferred channels of the present invention scanning, the step can by with
Lower method is realized：
E-1) two selections closest to channel of, routing node preferred channels according to used in its last time forwards data,
Used from selecting two during oneself there are the preferred channels of other routing nodes of same superior node with oneself last time
Two numerically closest channels of preferred channels, if two channels chosen are followed successively by ch_m_up, ch_n_up, its institute
The scan channel interval of composition is [ch_m_up, ch_n_up]；
In Fig. 1 and Fig. 3, if routing node 15 carries out scan channel, the preferred channels that the last time of routing node 15 uses
For ch_i_up, the currently used preferred channels of routing node 14,16 for having same superior node with the routing node are respectively
ch_m_up、ch_n_up；Routing node 8 by contrast judge after, find with its have same superior node routing node 14,
In 16, the immediate channels of preferred channels ch_i_up oneself used with the last time are ch_m_up, ch_n_up, then choose
[ch_m_up, ch_n_up] is the sweep interval of channel.In Fig. 3, channel ch_p_up, ch_q_up are with same superior node
All routing nodes in the minimum value and maximum of the channel that use.
E-2) chooses the channel less than threshold value, to the channel energy of interval [ch_m_up, ch_n_up] the interior channel of channel
Judged successively, if the channel energy of channel is less than threshold value set in advance, then it may be optimal to show the channel
Channel, preserves the channel number and channel energy of the channel；If the channel energy of channel is more than or equal to thresholding set in advance
Value, the channel is not involved in the selection of preferred channels；
Similarly, routing node sets threshold value during channel is screened using with terminal node identical method。
During channel of the routing node in interval [ch_m_up, ch_n_up] is scanned one by one, if with pointer
Pointer_ch is carried out, and pointer pointer_up is initially directed to channel ch_m_up, channel ch_m_up is judged, is judged
After finishing, pointer pointer_up adds 1, and all channels in channel interval [ch_m_up, ch_n_up] are judged successively；
And by judging whether pointer pointer_up has pointed to channel ch_n_up, to judge in interval [ch_m_up, ch_n_up]
All channels it is whether scanned.
E-3) whether all channels of judge to finish, and judge that channels all in channel interval [ch_m_up, ch_n_up] are
It is no to have judged to finish, if having judged to finish, perform step e-4)；If not judging to finish, step e- is performed
2)；
E-4) selection of preferred channels, comparison step e-2) in all eligible channels channel energy size, choosing
The channel corresponding to minimum channel energy is taken as the current preferred channels of the routing node；
Channel with minimum channel energy, both not shared by other nodes, is not affected by the more capable and experienced of outer signals again
Disturb, the characteristics of with " most clean ", thus suitable for the transmission of audio, video data.
E-5) the broadcast of preferred channels, routing node is chosen after preferred channels, and the preferred channels number currently chosen are broadcasted
Give other routing nodes oneself with same superior node.
The wireless multimedia sensor network channel scanning method of the low energy consumption of the present invention, to using multichannel mode networking
Wireless multimedia sensor network for, each terminal node or routing node it is determined that transmitting multimedia data use
Without being all scanned to channel all in channel space during preferred channels, seldom a part of wireless channel only need to be scanned i.e.
Can, so as to reduce the transmission delay of multi-medium data, simultaneously because need the wireless channel quantity scanned to decline to a great extent, because
This can also reduce the energy expenditure of network node, improve the utilization ratio for the energy consumption that network node scanning channel is used, and then
Improve the service life of network node.
Claims (3)
1. the wireless multimedia sensor network channel scanning method of a kind of low energy consumption, it is characterised in that comprise the following steps：
A) network designs, lay and set up the wireless multimedia sensor network of the tree topology of multichannel communication, its by
Terminal node (1), routing node (2) and Centroid (3) composition；
B) judgement of terminal nodes preferred channels, terminal node judges the last many matchmakers of transmission before multi-medium data is sent, first
Whether the preferred channels used during volume data are current still optimal, if still optimal, are maintained for preferred channels constant；If on
The current channel that once transmission data are used has not been optimal, then chooses preferred channels again by step c)；
C) selection again of terminal nodes preferred channels, terminal node selects two from the preferred channels of other terminal nodes
Two numerically closest channels of the individual preferred channels used with oneself last time, and to two selected channels it
Between all channels scan successively, selection is used as the current preferred channels of the terminal node with the channel of minimum channel energy；
D) judgement of routing nodes preferred channels, routing node judges the last many matchmakers of transmission before repeating multimedia data, first
Whether the preferred channels used during volume data are current still optimal, if still optimal, are maintained for preferred channels constant；If on
The current preferred channels that once transmission data are used have not been optimal, then choose preferred channels again by step e)；
E) selection again of routing nodes preferred channels, routing node is from oneself having other roads of same superior node
Numerically closest two of two preferred channels used with oneself last time are selected in the preferred channels of node
Channel, and all channels between two selected channels are scanned successively, channel of the selection with minimum channel energy is made
For the current preferred channels of the routing node；
In the judgement of step b) terminal node preferred channels and the deterministic process of step d) routing node preferred channels, if upper one
The secondary channel energy for sending the preferred channels that multi-medium data is used is less than threshold T set in advanceX, then it is assumed that the last time makes
Preferred channels are still current preferred channels；If the last time sends the channel energy for the preferred channels that multi-medium data is used
Amount is more than or equal to threshold T set in advanceX, then it is assumed that the preferred channels that the last time uses have not been current optimal letter
Road；
After if the terminal node (1) of wireless multimedia sensor network, routing node (2) and Centroid (3) deployment are finished, institute
The minimum value for having channel channel energy when not transmitting data is a, the maximum of channel energy, minimum value point when transmitting data
Wei not b, Tmin, then threshold T is setXMeet relational expression：A ＜ TX＜ Tmin＜ b.
2. the wireless multimedia sensor network channel scanning method of low energy consumption according to claim 1, it is characterised in that
The selection again of terminal node preferred channels described in step c) is realized by following steps：
C-1) two selections closest to channel of, terminal node preferred channels according to used in its last time sends data, from it
Selected in the preferred channels of its terminal node two preferred channels used with oneself last time it is numerically closest two
Individual channel, if two channels chosen are followed successively by ch_e_up, ch_f_up, its scan channel constituted interval is [ch_e_
Up, ch_f_up]；
C-2) chooses the channel less than threshold value, to the channel energy of interval [ch_e_up, ch_f_up] the interior channel of channel successively
Judged, if the channel energy of channel is less than threshold T set in advanceX, then it may be preferred channels to show the channel,
Preserve the channel number and channel energy of the channel；If the channel energy of channel is more than or equal to threshold T set in advanceX,
The channel is not involved in the selection of preferred channels；
C-3) whether all channels of judge to finish, and judge whether channels all in channel interval [ch_e_up, ch_f_up] are equal
Judge to finish, if having judged to finish, performed step c-4)；If not judging to finish, step c-2 is performed)；
C-4) selection of preferred channels, comparison step c-2) in all eligible channels channel energy size, choose most
Channel corresponding to small channel energy is used as the current preferred channels of the terminal node；
C-5) the broadcast of preferred channels, terminal node is chosen after preferred channels, and the preferred channels of selection are broadcast into other terminals
Node.
3. the wireless multimedia sensor network channel scanning method of low energy consumption according to claim 1, it is characterised in that
The selection again of routing node preferred channels described in step e) is realized by following steps：
E-1) two selections closest to channel of, routing node according to its last time forward data used in preferred channels, from
Oneself have same superior node other routing nodes preferred channels in select two with oneself last time use it is optimal
Two numerically closest channels of channel, if two channels chosen are followed successively by ch_m_up, ch_n_up, it is constituted
Scan channel interval be [ch_m_up, ch_n_up]；
E-2) chooses the channel less than threshold value, to the channel energy of interval [ch_m_up, ch_n_up] the interior channel of channel successively
Judged, if the channel energy of channel is less than threshold T set in advanceX, then it may be preferred channels to show the channel,
Preserve the channel number and channel energy of the channel；If the channel energy of channel is more than or equal to threshold T set in advanceX,
The channel is not involved in the selection of preferred channels；
E-3) whether all channels of judge to finish, and judge whether channels all in channel interval [ch_m_up, ch_n_up] are equal
Judge to finish, if having judged to finish, performed step e-4)；If not judging to finish, step e-2 is performed)；
E-4) selection of preferred channels, comparison step e-2) in all eligible channels channel energy size, choose most
Channel corresponding to small channel energy is used as the current preferred channels of the routing node；
E-5) the broadcast of preferred channels, routing node is chosen after preferred channels, and the preferred channels of selection are broadcast to and oneself tool
There are other routing nodes of same superior node.
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| CN109922507A (en) * | 2019-01-26 | 2019-06-21 | 成都鑫芯电子科技有限公司 | A kind of wireless transmitting system and method based on low-power consumption sensor |
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| CN103501540A (en) * | 2013-09-24 | 2014-01-08 | 浙江中控研究院有限公司 | Communication channel distribution method and device |
| CN103546911A (en) * | 2013-11-12 | 2014-01-29 | 上海交通大学 | Method for making wireless access points selected by optimal channels |
| CN103582136A (en) * | 2012-07-27 | 2014-02-12 | 上海交通大学 | Method for efficiently allocating channels in wireless sensor network with multiple channels used |
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| CN103582136A (en) * | 2012-07-27 | 2014-02-12 | 上海交通大学 | Method for efficiently allocating channels in wireless sensor network with multiple channels used |
| CN103501540A (en) * | 2013-09-24 | 2014-01-08 | 浙江中控研究院有限公司 | Communication channel distribution method and device |
| CN103546911A (en) * | 2013-11-12 | 2014-01-29 | 上海交通大学 | Method for making wireless access points selected by optimal channels |
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