CN102413552A - Wireless sensor node and node-level/network-level energy-saving algorithm thereof - Google Patents

Abstract

The invention discloses a wireless sensor node and a node-level/network-level energy-saving algorithm thereof. The wireless sensor node comprises a controller, a program downloading circuit of the controller, wireless transceiver modules which are connected with corresponding interfaces of the controller and the program downloading circuit of the controller, a power supply circuit, an interface circuit which is connected with an upper computer, and a temperature sensor. The node-level energy-saving algorithm is implemented by self-adaptation of the transmitting power of the wireless sensor node. The network-level energy-saving algorithm is implemented by automatically switching network routing communication modes. By adoption of an energy-saving policy provided by the invention, two problems of energy waste (node-level energy waste and network-level energy waste) are solved at the same time, the energy consumption of a wireless sensor network is reduced in two ways, and the operating time of the wireless sensor node is effectively prolonged.

Description

The energy-conservation algorithm of a kind of wireless sensor node and node level/network level thereof

Technical field

The present invention relates to a kind of design of communicate by letter Energy Saving Strategy and corresponding circuits, be specifically related to the energy-conservation algorithm of a kind of wireless sensor node and node level/network level thereof.

Background technology

At present; Wireless sensor network has been widely used in many aspects of productive life; Its microminiaturization, intellectuality and integrated characteristics make wireless sensor technology in environmental monitoring, obtain great application, comprise the monitoring of commercial production, agricultural production and natural environment.Yet increasing when network, the cycle that we need monitor is more and more longer, and the development of this technology has run into bottleneck---energy consumption.Drop in the wireless sensor network of using at present; For the reliability that guarantees to communicate by letter; Wireless sensing node always sends data with maximum transmission power, and this has caused the waste (node level energy dissipation) of energy with regard to causing the nearer node of range data bleeding point, and the group-net communication mode of whole network all is unalterable after networking is accomplished; This also causes when network changes, and the group-net communication mode can not dynamically adapt to this variation (network level energy dissipation).Do not have a kind of strategy at present and can solve this two kinds of energy dissipation problems.

Summary of the invention

Deficiency to the prior art existence; The object of the invention provides a kind of when network changes; The group-net communication mode can dynamically adapting wireless sensor node and the energy-conservation algorithm of node level/network level thereof, reduced the network level energy consumption, reduced the node level energy consumption simultaneously.

To achieve these goals, the present invention realizes through following technical scheme:

Wireless sensor node of the present invention comprises controller and program download circuit and the wireless transceiver module, power supply circuits, the interface circuit that is connected with host computer and the temperature sensor that are connected with controller and program download circuit corresponding interface thereof; Wireless transceiver module comprises rf chip, is provided with a RSSI register and a PATABEL register that is used to write transmit signal power that is used to store received signal power in the rf chip.

The energy-conservation algorithm of node level of the present invention is to realize through the transmission power adaptation of wireless sensor node, and its algorithm specifically comprises following step:

(1) the center monitoring unit is with maximum transmission power P _TmaxSend data to wireless sensor node;

(2) detect the received signal power P that wireless sensor node receives _{R (SHK)}

(3) on the basis that guarantees reliable communication, the minimum necessary transmitting power P of wireless sensor node _T,

$P_T=P_S\·\frac{P_{T\max }}{P_{R\left(\mathrm{SHK}\right)}}---\left(1\right)$

Wherein, P _SThe expression receiver sensitivity, when receiver was selected, this amount was a constant;

(4) with the received signal power P of wireless sensor node _{R (SHK)}Take the logarithm ten times, be converted into a binary RSSI (received signal strength indicator-receives the signal strength signal intensity indication) then, then according to formula (1), with the minimum necessary transmitting power of binary representation do

PATABEL＝10·lgP _S+10·lgP _Tmax-RSSI (2)。

The energy-conservation algorithm of network level of the present invention is realized through between centralized routing mode and sub-clustering formula routing mode, switching, and the foundation of switching is the whole energy consumption of network, and its algorithm specifically comprises following step:

Step (1): center monitoring unit CMU is with maximum transmission power P _TmaxSend test patterns Test Code 1 to wireless sensor node node i, center monitoring unit CMU gets into and waits for accepting state then, turns to step (2);

Step (2): after wireless sensor node node i receives Test Code 1; Wireless sensor node node i reads the RSSI value from the RSSI register of rf chip; And the RSSI value sent to center monitoring unit CMU, utilize formula (2) to calculate PATABEL then _i, turn to step (3);

Step (3): center monitoring unit CMU receives after the RSSI value from wireless sensor node node i, utilizes the minimum necessary transmitting power P of formula (2) and formula (3) estimation _{T (S1) i}, and storage P _{T (S1) i},

$P_{T\left(s1\right)i}={10}^{\frac{{\mathrm{PATABEL}}_i}{10}}---\left(3\right)$

Wherein, be illustrated under the centralized routing mode, turn to step (4) with s1;

Step (4): each the wireless sensor node repeating step (1) in the network to step (3), is all visited up to each wireless sensor node, turn to step (5) then;

Step (5): center monitoring unit CMU utilizes formula (4) to calculate the energy consumption P of whole network under centralized routing mode _T1

${\mathrm{<figure-callout\; id="1"\; label="P\; T"\; filenames="HDA0000112969920000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_T=\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{P}_{T\left(s1\right)i}---\left(4\right)$

Wherein, M representes wireless sensor node number total in the network, turns to step (6);

Step (6): center monitoring unit CMU is with maximum transmission power P _TmaxSend test patterns Test Code 2 to the wireless sensor node Cluster head m as bunch head, center monitoring unit CMU gets into and waits for accepting state then, turns to step (7);

Step (7): receive after the TestCode 2 as the wireless sensor node Cluster head m of bunch head, read the RSSI value of RSSI register, and storage RSSI value, turn to step (8);

Step (8): as the wireless sensor node Cluster head m of bunch head with maximum transmission power P _TmaxNot as the wireless sensor node Cluster node n transmission test patterns Test Code 3 of bunch head, the wireless sensor node Cluster head m as bunch head gets into the wait accepting state then, turns to step (9) in this bunch;

Step (9): the wireless sensor node Cluster node n as bunch head does not receive after the Test Code 3; Read the RSSI value of RSSI register; And the RSSI value sent to the wireless sensor node Cluster head m as bunch head, utilize formula (2) to calculate PATABEL then _Mn, turn to step (10);

Step (10): after receiving the RSSI value, storage RSSI value turns to step (11) as the wireless sensor node Cluster head m of bunch head;

Step (11): to bunch in each as the wireless sensor node repeating step (8) of bunch head to step (10), up to bunch in each all do not visited as the wireless sensor node of bunch head;

Wireless sensor node Cluster head m as bunch head sends to center monitoring unit CMU with these RSSI values then;

Center monitoring unit CMU receives after these RSSI values, utilizes the minimum necessary transmitting power P of formula (2) and formula (5) estimation _{T (S2) mn}, and storage P _{T (S2) mn},

$P_{T\left(S2\right)\mathrm{mn}}={10}^{\frac{{\mathrm{PAYABEL}}_{\mathrm{mn}}}{10}}---\left(5\right)$

Wherein, be illustrated under the sub-clustering formula routing mode, turn to step (12) then with s2;

Step (12): repeating step (6) all is accessed to up to each bunch to step (11), turns to step (13);

Step (13): center monitoring unit CMU utilizes formula (6) to calculate the network power consumption P under the sub-clustering formula routing mode then _T2

${\mathrm{<figure-callout\; id="2"\; label="P\; T"\; filenames="HDA0000112969920000031.png,HDA0000112969920000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_T=\underset{m=1}{\overset{O}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{P}{\mathrm{\&Sigma;}}}{P}_{T\left(S2\right)\mathrm{mn}}---\left(6\right)$

Wherein, O representes the number of all bunches in the network, and P representes wireless sensor node number in each bunch, turns to step (14);

Step (14): center monitoring unit CMU comparing cell power consumption P _T1And P _T2If, P _T1＞P _T2, then center monitoring unit CMU on-air testing sign indicating number Test Code 4 turns to step (15);

If P _T1＜P _T2, then center monitoring unit CMU on-air testing sign indicating number Test Code 5 turns to step (16);

Step (15): Test Code 4 notifies each wireless sensor node with the networking of sub-clustering formula routing mode, and each wireless sensor node is set PATABEL after receiving Test Code 4 _iBe transmit signal power, and with the address of center monitoring unit CMU as destination address, finish;

Step (16): Test Code 5 notifies each wireless sensor node with centralized routing mode networking, and each wireless sensor node as bunch head is set PATABEL after receiving Test Code 5 _MnBe transmit signal power, and with the address of center monitoring unit CMU as destination address, each does not set PATABEL after not receiving Test Code 5 as the wireless sensor node of bunch head _MnBe transmit signal power, and the wireless sensor node address of setting corresponding conduct bunch head is finished as destination address.

Beneficial effect of the present invention is following:

(1) the present invention can make the sensing node in the wireless sensor network, estimates minimum necessary transmitting power through detecting from the received power of data-collection nodes signal, realizes the self adaptation of node transmitting power, and it is energy-conservation to accomplish node level;

(2) the present invention can pass through to compare under the current network, the energy consumption of two kinds of different routing to communicate modes, thus switch to the lower routing to communicate mode of energy consumption, realize that the self adaptation of routing to communicate mode is switched, it is energy-conservation to accomplish network level;

(3) Energy Saving Strategy proposed by the invention solves two energy dissipation problems (node level energy dissipation and network level energy dissipation) simultaneously, reduces the energy consumption of wireless sensor networks from two aspects, effectively prolongs the operating time of node.

Description of drawings

Fig. 1 is a wireless sensor node circuit diagram of the present invention;

Fig. 2 is the energy-conservation centralized routing mode structural representation of network level;

Fig. 3 is the energy-conservation sub-clustering formula routing mode structural representation of network level;

Fig. 4 is the software flow pattern of the energy-conservation algorithm of center monitoring unit CMU operational network level;

Fig. 5 is the software flow pattern of the energy-conservation algorithm of wireless sensor node operational network level.

Embodiment

For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with embodiment, further set forth the present invention.

Participate in Fig. 1, wireless sensor node comprises MCU controller and program download circuit thereof, RF1101 wireless transceiver module, lithium battery power supply voltage stabilizing circuit, RS232 interface circuit, DS18B20 digital temperature sensor.

Wherein, The MCU controller is selected the C8051F320 microprocessor chip for use; The RF1101 wireless transceiver module adopts the Chipcon CC1101 rf chip of TI company; The MCU controller links to each other with the RF1101 wireless transceiver module through the SPI interface, in Chipcon CC1101 rf chip, and the received signal power P of wireless sensor node _RBe converted into a binary system amount RSSI (received signal strength indicator-receives the signal strength signal intensity indication) expression; Be stored in the RSSI register; And; In Chipcon CC1101 rf chip, also have a PATABEL register, be used for the value of writing to confirm the transmitting power of chip.

Wireless sensor node is through the power supply of lithium battery power supply voltage stabilizing circuit; Wireless sensor node communicates through RS232 interface circuit and host computer, and in the RS232 interface circuit, the R1OUT of MAX232 chip links to each other with the TXD pin with the RXD of MCU controller respectively with the T1IN pin; The MCU controller is collected ambient temperature data through DS18B20 digital temperature sensor circuit sense ambient temperature, and the P2.3 pin of MCU controller links to each other with the DQ pin of DS18B20.

The MCU controller is through SPI interface and the communication of RF1101 wireless transceiver module; The P0.0 of C8051F320, P0.1, P0.2, P0.3, P0.6, P0.7 pin link to each other with SCLK, SO, SI, CSN, GDO2, the GDO0 of RF1101 wireless transceiver module respectively, and C8051F320 controls the RF1101 wireless transceiver module through the mode of simulation SPI.

The energy-conservation algorithm of node level is to realize through the transmission power adaptation of wireless sensor node, and its algorithm specifically comprises following step:

(1) the center monitoring unit is with maximum transmission power P _TmaxSend data to wireless sensor node;

(2) detect the received signal power P that wireless sensor node receives _{R (SHK)}(SHK-handshaking, handshake);

(3) on the basis that guarantees reliable communication, the minimum necessary transmitting power P of wireless sensor node _T,

$P_T=P_S\&CenterDot;\frac{P_{T\max }}{P_{R\left(\mathrm{SHK}\right)}}---\left(1\right)$

Wherein, P _SExpression receiver sensitivity (minimum signal power that receiver can be differentiated), when receiver was selected, this amount was a constant;

(4) with the received signal power P of wireless sensor node _{R (SHK)}Take the logarithm ten times, be converted into a binary RSSI (received signal strength indicator-receives the signal strength signal intensity indication) then, then according to formula (1), with the minimum necessary transmitting power of binary representation do

PATABEL＝10·lgP _S+10·lgP _Tmax-RSSI (2)。

Represent the PATABEL register value with PATABEL (formula (2) equal sign the right) as a variable, formula (2) is taken the logarithm to formula (1) equal sign both sides and is obtained, wherein, and the corresponding 10lgP of PATABEL _T, the corresponding 10lgP of RSSI _{R (SHK)}

The energy-conservation algorithm of network level realizes that through between centralized routing mode and sub-clustering formula routing mode, switching these two kinds of routing to communicate mode sketch mapes are participated in Fig. 2 and Fig. 3.

Centralized routing mode: the data that each wireless sensor node is collected directly send to center monitoring unit CMU (central monitoring unit), and need not pass through a series of routing forwarding; Centralized routing mode is a prior art, repeats no more here.

Sub-clustering formula routing mode: in this mode, wireless sensor node will be divided into different groups, be referred to as bunch.Each wireless sensor node at first sends to a bunch head with the data of collecting, and is transmitted to center monitoring unit CMU through a bunch head then.Sub-clustering formula routing mode is a prior art, repeats no more here.

These two kinds of routing to communicate modes will be selected in the networking process, and energy-conservation the switching through the self adaptation of these two kinds of routing to communicate modes just of network level realized, and the foundation of switching is the whole energy consumption of network.

Fig. 4 has provided the software flow pattern of center monitoring unit CMU, has mainly accomplished the collection of energy-related information, the calculating of network energy consumption and the automatic switchover of network routing mode.Fig. 5 has then provided the software flow pattern of sensing node (comprising bunch head and non-leader cluster node), and calculating and the networking structure mode of mainly accomplishing minimum necessary transmitting power are switched.

The energy-conservation algorithm of network level of the present invention is realized through between centralized routing mode and sub-clustering formula routing mode, switching, and the foundation of switching is the whole energy consumption of network, and its algorithm specifically comprises following step:

Step (1): center monitoring unit CMU is with maximum transmission power P _TmaxSend test patterns Test Code 1 to wireless sensor node node i, center monitoring unit CMU gets into and waits for accepting state then, turns to step (2);

Step (2): after wireless sensor node node i receives Test Code 1; Wireless sensor node node i reads the RSSI value from the RSSI register of Chipcon CC1101 rf chip; And the RSSI value sent to center monitoring unit CMU, center monitoring unit CMU utilizes formula (2) to calculate PATABEL then _i, turn to step (3); Test Code 1 postbacks the RSSI value and calculates PATABEL to center monitoring unit CMU in order to notify each wireless sensor node _i

Step (3): center monitoring unit CMU receives after the RSSI value from wireless sensor node node i, utilizes the minimum necessary transmitting power P of formula (2) and formula (3) estimation _{T (S1) i}, and storage P _{T (S1) i},

$P_{T\left(s1\right)i}={10}^{\frac{{\mathrm{PATABEL}}_i}{10}}---\left(3\right)$

Wherein, be illustrated under the centralized routing mode with s1,1≤i≤M turns to step (4);

Step (4): each the wireless sensor node repeating step (1) in the network to step (3), is all visited up to each wireless sensor node, turn to step (5) then;

Step (5): center monitoring unit CMU utilizes formula (4) to calculate the energy consumption P of whole network under centralized routing mode _T1

${\mathrm{<figure-callout\; id="1"\; label="P\; T"\; filenames="HDA0000112969920000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_T=\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{P}_{T\left(s1\right)i}---\left(4\right)$

Wherein, M representes wireless sensor node number total in the network, turns to step (6);

Step (6): center monitoring unit CMU is with maximum transmission power P _TmaxSend test patterns Test Code 2 to the wireless sensor node Cluster head m as bunch head, center monitoring unit CMU gets into and waits for accepting state then, turns to step (7);

Step (7): receive after the TestCode 2 as the wireless sensor node Cluster head m of bunch head, read the RSSI value of RSSI register, and storage RSSI value, turn to step (8);

Step (8): as the wireless sensor node Cluster head m of bunch head with maximum transmission power P _TmaxNot as the wireless sensor node Cluster node n transmission test patterns Test Code 3 of bunch head, the wireless sensor node Cluster head m as bunch head gets into the wait accepting state then, turns to step (9) in this bunch;

Step (9): the wireless sensor node Cluster node n as bunch head does not receive after the TestCode 3; Read the RSSI value of RSSI register; And the RSSI value sent to the wireless sensor node Cluster head m as bunch head, utilize formula (2) to calculate PATABEL then _Mn, turn to step (10); 1≤m≤O wherein, 1≤n≤P, Test Code 2 in order to notify each as the wireless sensor node of bunch head to bunch in each does not send Test Code 3 as the wireless sensor node of bunch head; Each does not postback RSSI value and calculating PATABEL as the wireless sensor node of bunch head to the wireless sensor node as bunch head to Test Code 3 in order in the notice bunch _Mn

Step (10): after receiving the RSSI value, storage RSSI value turns to step (11) as the wireless sensor node Cluster head m of bunch head;

Step (11): to bunch in each as the wireless sensor node repeating step (8) of bunch head to step (10), up to bunch in each all do not visited as the wireless sensor node of bunch head;

Wireless sensor node Cluster head m as bunch head sends to center monitoring unit CMU with these RSSI values then;

Center monitoring unit CMU receives after these RSSI values, utilizes the minimum necessary transmitting power P of formula (2) and formula (5) estimation _{T (S2) mn}, and storage P _{T (S2) mn},

$P_{T\left(S2\right)\mathrm{mn}}={10}^{\frac{{\mathrm{PAYABEL}}_{\mathrm{mn}}}{10}}---\left(5\right)$

Wherein, be illustrated under the sub-clustering formula routing mode, turn to step (12) then with s2;

Step (12): repeating step (6) all is accessed to up to each bunch to step (11), turns to step (13);

Step (13): center monitoring unit CMU utilizes formula (6) to calculate the network power consumption P under the sub-clustering formula routing mode then _T2

${\mathrm{<figure-callout\; id="2"\; label="P\; T"\; filenames="HDA0000112969920000031.png,HDA0000112969920000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_T=\underset{m=1}{\overset{O}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{P}{\mathrm{\&Sigma;}}}{P}_{T\left(S2\right)\mathrm{mn}}---\left(6\right)$

Wherein, O representes the number of all bunches in the network, and P representes wireless sensor node number in each bunch, turns to step (14);

Step (14): center monitoring unit CMU comparing cell power consumption P _T1And P _T2If, P _T1＞P _T2, then center monitoring unit CMU on-air testing sign indicating number Test Code 4 turns to step (15);

If P _T1＜P _T2, then center monitoring unit CMU on-air testing sign indicating number Test Code 5 turns to step (16);

Step (15): Test Code 4 notifies each wireless sensor node with the networking of sub-clustering formula routing mode, and each wireless sensor node is set PATABEL after receiving Test Code 4 _iBe transmit signal power, and with the address of center monitoring unit CMU as destination address, finish;

Step (16): Test Code 5 notifies each wireless sensor node with centralized routing mode networking, and each wireless sensor node as bunch head is set PATABEL after receiving Test Code 5 _MnBe transmit signal power, and with the address of center monitoring unit CMU as destination address, each does not set PATABEL after not receiving Test Code 5 as the wireless sensor node of bunch head _MnBe transmit signal power, and the wireless sensor node address of setting corresponding conduct bunch head is finished as destination address.

More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection range to be defined by appending claims and equivalent thereof.

Claims (3)

1. a wireless sensor node is characterized in that,

Comprise controller and program download circuit thereof and the wireless transceiver module, power supply circuits, the interface circuit that is connected with host computer and the temperature sensor that are connected with controller and program download circuit corresponding interface thereof;

Said wireless transceiver module comprises rf chip, is provided with a RSSI register and a PATABEL register that is used to write transmit signal power that is used to store received signal power in the said rf chip.

2. based on the energy-conservation algorithm of the node level of the said wireless sensor node of claim 1, it is characterized in that,

Be to realize through the transmission power adaptation of wireless sensor node, its algorithm specifically comprises following step:

(1) the center monitoring unit is with maximum transmission power P _TmaxSend data to wireless sensor node;

(2) detect the received signal power P that wireless sensor node receives _{R (SHK)}

(3) on the basis that guarantees reliable communication, the minimum necessary transmitting power P of wireless sensor node _T,

$P_T=P_S\&CenterDot;\frac{P_{T\max }}{P_{R\left(\mathrm{SHK}\right)}}---\left(1\right)$

Wherein, P _SThe expression receiver sensitivity, when receiver was selected, this amount was a constant;

(4) with the received signal power P of wireless sensor node _{S (SHK)}Take the logarithm ten times, be converted into a binary RSSI then, then according to formula (1), with the minimum necessary transmitting power of binary representation do

PATABEL＝10·lgP _S+10·lgP _Tmax-RSSI (2)。

3. based on the energy-conservation algorithm of network level of the energy-conservation algorithm of the said node level of claim 2, it is characterized in that,

Realize through between centralized routing mode and sub-clustering formula routing mode, switching, and the foundation of switching is the whole energy consumption of network that its algorithm specifically comprises following step:

Step (1): center monitoring unit CMU is with maximum transmission power P _TmaxSend test patterns Test Code 1 to wireless sensor node node i, center monitoring unit CMU gets into and waits for accepting state then, turns to step (2);

Step (2): after wireless sensor node node i receives Test Code 1; Wireless sensor node node i reads the RSSI value from the RSSI register of rf chip; And the RSSI value sent to center monitoring unit CMU, utilize formula (2) to calculate PATABEL then _i, turn to step (3);

Step (3): center monitoring unit CMU receives after the RSSI value from wireless sensor node node i, utilizes the minimum necessary transmitting power P of formula (2) and formula (3) estimation _{T (S1) i}, and storage P _{T (S1) i},

$P_{T\left(s1\right)i}={10}^{\frac{{\mathrm{PATABEL}}_i}{10}}---\left(3\right)$

Wherein, be illustrated under the centralized routing mode, turn to step (4) with s1;

Step (4): each the wireless sensor node repeating step (1) in the network to step (3), is all visited up to each wireless sensor node, turn to step (5) then;

Step (5): center monitoring unit CMU utilizes formula (4) to calculate the energy consumption P of whole network under centralized routing mode _T1

$P_{T1}=\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{P}_{T\left(s1\right)i}---\left(4\right)$

Wherein, M representes wireless sensor node number total in the network, turns to step (6);

Step (6): center monitoring unit CMU is with maximum transmission power P _TmaxSend test patterns Test Code 2 to the wireless sensor node Cluster head m as bunch head, center monitoring unit CMU gets into and waits for accepting state then, turns to step (7);

Step (7): receive after the Test Code 2 as the wireless sensor node Cluster head m of bunch head, read the RSSI value of RSSI register, and storage RSSI value, turn to step (8);

Step (8): as the wireless sensor node Cluster head m of bunch head with maximum transmission power P _TmaxNot as the wireless sensor node Cluster node n transmission test patterns Test Code 3 of bunch head, the wireless sensor node Cluster head m as bunch head gets into the wait accepting state then, turns to step (9) in this bunch;

Step (9): the wireless sensor node Cluster node n as bunch head does not receive after the Test Code 3; Read the RSSI value of RSSI register; And the RSSI value sent to the wireless sensor node Cluster head m as bunch head, utilize formula (2) to calculate PATABEL then _Mn, turn to step (10);

Step (10): after receiving the RSSI value, storage RSSI value turns to step (11) as the wireless sensor node Cluster head m of bunch head;

Step (11): to bunch in each as the wireless sensor node repeating step (8) of bunch head to step (10), up to bunch in each all do not visited as the wireless sensor node of bunch head;

Wireless sensor node Cluster head m as bunch head sends to center monitoring unit CMU with these RSSI values then;

Center monitoring unit CMU receives after these RSSI values, utilizes the minimum necessary transmitting power P of formula (2) and formula (5) estimation _{T (S2) mn}, and storage P _{T (S2) mn},

$P_{T\left(S2\right)\mathrm{mn}}={10}^{\frac{{\mathrm{PAYABEL}}_{\mathrm{mn}}}{10}}---\left(5\right)$

Wherein, be illustrated under the sub-clustering formula routing mode, turn to step (12) then with s2;

Step (12): repeating step (6) all is accessed to up to each bunch to step (11), turns to step (13);

Step (13): center monitoring unit CMU utilizes formula (6) to calculate the network power consumption P under the sub-clustering formula routing mode then _T2

$P_{T2}=\underset{m=1}{\overset{O}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{P}{\mathrm{\&Sigma;}}}{P}_{T\left(S2\right)\mathrm{mn}}---\left(6\right)$

Wherein, O representes the number of all bunches in the network, and P representes wireless sensor node number in each bunch, turns to step (14);

Step (14): center monitoring unit CMU comparing cell power consumption P _T1And P _T2If, P _T1＞P _T2, then center monitoring unit CMU on-air testing sign indicating number Test Code 4 turns to step (15);

If P _T1＜P _T2, then center monitoring unit CMU on-air testing sign indicating number Test Code 5 turns to step (16);

Step (15): Test Code 4 notifies each wireless sensor node with the networking of sub-clustering formula routing mode, and each wireless sensor node is set PATABEL after receiving Test Code 4 _iBe transmit signal power, and with the address of center monitoring unit CMU as destination address, finish;

Step (16): Test Code 5 notifies each wireless sensor node with centralized routing mode networking, and each wireless sensor node as bunch head is set PATABEL after receiving Test Code 5 _MnBe transmit signal power, and with the address of center monitoring unit CMU as destination address, each does not set PATABEL after not receiving Test Code 5 as the wireless sensor node of bunch head _MnBe transmit signal power, and the wireless sensor node address of setting corresponding conduct bunch head is finished as destination address.

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