CN102612122A - Low-power-consumption wireless sensor network system and controlling and awaking method thereof - Google Patents
Low-power-consumption wireless sensor network system and controlling and awaking method thereof Download PDFInfo
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Abstract
The invention discloses a low-power-consumption wireless sensor network system and a controlling and awaking method thereof. A network coordinator module in the low-power-consumption wireless sensor network system sends a low-frequency awaking signal to a slave node module and awakes a target node as required through the low-frequency awaking signal when the target node needs to be awaked, the target node is utilized more effectively, so that the effective utilization rate of the node power is greatly improved, the service life of the wireless sensor network system is prolonged to a certain degree, the performance of the wireless sensor network system is improved, and energy-saving and environment-friendly ideas are embodied. According to the awaking method disclosed by the invention, the target node is controlled and awaked through the low-frequency awaking signal, the awaking operation is determined according to a high-frequency awaking determination signal, and thus mutual interference among signals can be effectively reduced at the same time that the target node awaking reliability is ensured.
Description
Technical field
The present invention relates to the wireless sensor network field, be specifically related to a kind of sensor network nodes is carried out the network system of initiatively waking up and controls awakening method based on the low frequency wake-up technology.
Background technology
Along with the development of wireless sensor network technology, sensor network system has obtained using widely.Then, because sensor node is mainly battery-powered, in most cases; In a single day the energy content of battery is used up; This sensor node has also just lost effect, and the manufacturing technology of battery does not have breakthrough development, is unpractical by the problem in useful life that increases battery electric quantity solution wireless sensor network system therefore; Thereby the power consumption of wireless sensor network node is significant to the development of wireless sensor network system, must reduce the power consumption of node as far as possible.
Wireless sensor network is meant by being distributed in a kind of novel information that wireless sensor node abundant in the specific region constitutes and obtains system.Each sensor node is equipped with one or more transducers (for example temperature sensor, humidity sensor, sound inductor, optical sensor, infrared inductor, magnetic inductor, shock sensor etc.) and has the certain calculation disposal ability.Between each node through proprietary network protocol realize information interchange, compile and handle, and through special Ad-hoc network of communication formation, thereby be implemented in detection, identification, location and the tracking of specific region internal object.
But existing wireless sensor network system adopts timing dormancy to wake mode up more, each node in the wake on wireless sensor network in cycle.Though it is this mode has reduced the power consumption of wireless sensor network system to a certain extent, still lower to the effective rate of utilization of node power consumption.For instance; The clocking error of cycle timing wake-up mode is accumulation constantly; Therefore very high and need periodic calibration clock to the required precision of clock, and the action need of calibration clock through with node communication as clock reference, this traffic operation has been wasted a part of power consumption.In addition, under many circumstances, need not transmit data after the node periodic wakeup, a part of power consumption has been wasted in this operation equally.For this reason, seeking a kind of low frequency wake-up technology of passing through, realize the extremely low power dissipation of wireless sensor network system, is to be engaged in the technical staff of wireless sensor network system application study when previous important problem direction and goal in research.
Summary of the invention
The object of the invention is to provide a kind of power consumption wireless sensor network system and control awakening method thereof, and it can solve the problem in useful life of wireless sensor network system, realizes system low-power consumption, and improves the performance of wireless sensor network system.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A kind of power consumption wireless sensor network system; Network node in the said network system comprises that wireless sensor network coordinator module and wireless senser are from node module; Said wireless sensor network coordinator module comprises the first controlled in wireless communication unit, first data processing unit and the first RFDC unit; The low frequency wake-up signal is sent in the control of first wireless communication control unit; The said first RFDC unit is used to intercept the low frequency wake-up confirmation signal; Said first data processing unit is used to control the first controlled in wireless communication unit and the first RFDC unit; Said wireless senser comprises the second controlled in wireless communication unit, second data processing unit and the second RFDC unit from node module; The second controlled in wireless communication unit is used to intercept low frequency wake-up signal frequency range, and the said second RFDC unit is used for transmission and wakes confirmation signal up, and said second data processing unit is used to control the second controlled in wireless communication unit and the second RFDC unit.
Detailed technical scheme is: a kind of power consumption wireless sensor network system; Network node in the said network system comprises that wireless sensor network coordinator module and wireless senser are from node module; Said wireless sensor network coordinator module comprises the first controlled in wireless communication unit, first data processing unit and the first RFDC unit; The low frequency wake-up signal is sent in the control of first wireless communication control unit; The said first RFDC unit is used to intercept the low frequency wake-up confirmation signal; Said first data processing unit is used to control the first controlled in wireless communication unit and the first RFDC unit; Said wireless senser comprises the second controlled in wireless communication unit, second data processing unit and the second RFDC unit from node module, and the second controlled in wireless communication unit is used to intercept low frequency wake-up signal frequency range, and the said second RFDC unit is used for transmission and wakes confirmation signal up; Said second data processing unit is used to control the second controlled in wireless communication unit and the second RFDC unit; Said wireless sensor network coordinator module adopts the power supply power supply, and said wireless senser adopts powered battery from node module, and the said working frequency range that is used for the low frequency wake-up signal of low frequency wake-up is 125KHz; The working frequency range of said low frequency wake-up confirmation signal is 2.4GHz; Said wireless senser also comprises the memory cell that is used to store the information of setting from node module, and said memory cell links to each other with the second wireless data processing unit, and said memory cell can be by the second data processing unit access control.
The present invention also provides a kind of control awakening method based on above-mentioned power consumption wireless sensor network system, and concrete technical scheme is:
A kind of wake-up control method of power consumption wireless sensor network system, the concrete workflow of said wake-up control method is:
A. first data processing unit in the wireless sensor network coordinator module is controlled the first controlled in wireless communication unit and is sent the low frequency wake-up signal in order to destination node that wakes communication task up and the timeout mechanism that startup first data processing unit is set, and the first RFDC unit continues to intercept the low frequency wake-up confirmation signal then;
B. the second controlled in wireless communication unit of wireless senser from node module continues to intercept the low frequency wake-up frequency range and the signal in this frequency range screened; If received low frequency wake-up signal does not meet the appointment requirement; Second data processing unit and the second RFDC unit keep low-power sleep state; If the low frequency wake-up signal meets the appointment requirement; Then start second data processing unit and the second RFDC unit and send and wake confirmation signal up, second data processing unit switches to accepting state and the startup timeout mechanism is set;
C. the wireless sensor network coordinator module receives in preset time-out time and effectively wakes confirmation signal up, then sends command signal and the startup timeout mechanism is set to destination node through the first RFDC unit;
D. wireless senser receives the command signal of sending from the first RFDC unit from the second RFDC unit of node module; Abandon this communication task and return low-power sleep state if time of reception surpassed from the default time of node module, if time of reception is in the default time from node module then second data processing unit starts communication task;
E. after wireless senser was accomplished communication task from node module, it was listen mode that the second controlled in wireless communication unit is set, and second data processing unit and the second RFDC unit are low power sleep mode.
For above-mentioned control awakening method; As optimization; When the first controlled in wireless communication unit described in the steps A carries out the transmission of low frequency wake-up signal, close the first RFDC unit, the signal of low frequency wake-up described in the steps A is the device id information that comprises the required destination node that wakes up; Wireless senser is differentiated the low frequency wake-up signal from the id information of node module bonding apparatus self among the step B, and then wakes second data processing unit and the second RFDC unit under it up.
With respect to scheme of the prior art, advantage of the present invention is:
1. the network coordinator module in the network system described in the invention is sent the low frequency wake-up signal extremely from node module; When destination node needs to be waken up through above-mentioned low frequency wake-up signal wake up target node as required; More effectively utilize destination node; Make the effective rate of utilization of node power greatly improve; This has also just prolonged the useful life of wireless sensor network system to a certain extent, has not only improved the performance of wireless sensor network system, has embodied the theory of energy-conserving and environment-protective again;
2. the present invention also provides a kind of control awakening method based on above-mentioned network system; Said awakening method is through low frequency wake-up signal controlling wake up target node; Waking confirmation signal up through high frequency again confirms wake operation; When guaranteeing that destination node wakes reliability up, also can effectively reduce mutual interference among signals.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Fig. 1 is an overall structure sketch map of the present invention.
Embodiment
Below in conjunction with specific embodiment such scheme is further specified.Should be understood that these embodiment are used to the present invention is described and are not limited to limit scope of the present invention.The implementation condition that adopts among the embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in the normal experiment.
Embodiment:
The described power consumption wireless sensor network system of present embodiment; Its structure is as shown in Figure 1; Network node in the said network system comprises that wireless sensor network coordinator module and wireless senser are from node module; Said wireless sensor network coordinator module comprises the first controlled in wireless communication unit, first data processing unit and the first RFDC unit; The low frequency wake-up signal is sent in the control of first wireless communication control unit; The said first RFDC unit is used to intercept the low frequency wake-up confirmation signal; Said first data processing unit is used to control the first controlled in wireless communication unit and the first RFDC unit, and said wireless senser comprises the second controlled in wireless communication unit, second data processing unit and the second RFDC unit from node module, and the second controlled in wireless communication unit is used to intercept low frequency wake-up signal frequency range; The said second RFDC unit is used for transmission and wakes confirmation signal up, and said second data processing unit is used to control the second controlled in wireless communication unit and the second RFDC unit.
Said wireless sensor network coordinator module adopts the power supply power supply; Said wireless senser adopts powered battery from node module; The said working frequency range that is used for the low frequency wake-up signal of low frequency wake-up is 125KHz; The working frequency range of said low frequency wake-up confirmation signal is 2.4GHz; Said wireless senser also comprises the memory cell that is used to store the information of setting from node module, and said memory cell links to each other with the second wireless data processing unit, and said memory cell can be by the second data processing unit access control.
Present embodiment also provides a kind of control awakening method based on above-mentioned power consumption wireless sensor network system, and concrete technical scheme is:
A kind of wake-up control method of power consumption wireless sensor network system.
The wireless sensor network coordinator module gets into the cycle detection state after initialization; At first detect its serial ports place whether data are arranged; If free of data then inquire about timing device and interrupt situation, if interrupt, then the first controlled in wireless communication unit sends the low frequency wake-up signal in the 125KHz frequency range; Whether if do not interrupt, then returning continuation detection serial ports place has data.And when detecting the serial ports place and really data are arranged, then it is carried out integrity detection, for non-complete situation; Then take to abandon this packet; And return and continue to detect the serial ports place whether data are arranged, for the complete situation of packet, according to the difference of bag type; In flash memory, write accordingly and to the module setting, perhaps read designated frame and it is sent from serial ports.
Network coordinator module transmission low frequency wake-up signal and the 50ms after wake-up signal sends completion receive in the time and wake confirmation signal up; If successfully receiving in the time, 50ms wakes confirmation signal up; Whether be the destination node that will communicate by letter, if MAC number is correctly then carried out data communication if then judge sending node M AC number of waking confirmation signal up; If do not receive the MAC number incorrect wake-up signal that then resends of affirmation signal that wakes confirmation signal up or receive in the time at 50ms.In addition, if send that 3 wake-up signals still can't carry out data communication then the communication of thinking can't be proceeded, the network coordinator module will be abandoned current data communications task.
When wireless senser is in sleep state from node module; Only the second controlled in wireless communication unit is in the state of intercepting and intercepts the 125kHz electromagnetic wave signal; The second controlled in wireless communication unit is behind the signal that listens to the 125kHz frequency range; Second data processing unit judges whether this signal mode meets this node through user configured mode signal requirement, if undesirable second data processing unit then return and continue to intercept signal condition, if the wake-up signal of receiving would meet the requirements; Then second data processing unit wakes the second RFDC unit up, and carries out the related service program.After inter-related task was accomplished, second data processing unit from node module, the second RFDC unit got into sleep state once more, and the second controlled in wireless communication unit returns the state of intercepting.
Network coordinator module in the described network system of present embodiment is sent the low frequency wake-up signal extremely from node module; When destination node needs to be waken up through above-mentioned low frequency wake-up signal wake up target node as required; More effectively utilize destination node, make the effective rate of utilization of node power greatly improve, this has also just prolonged the useful life of wireless sensor network system to a certain extent; Not only improve the performance of wireless sensor network system, embodied the theory of energy-conserving and environment-protective again.In addition, said control awakening method wakes confirmation signal up through high frequency again wake operation is confirmed through low frequency wake-up signal controlling wake up target node, when guaranteeing that destination node wakes reliability up, also can effectively reduce mutual interference among signals.
Above-mentioned instance only is explanation technical conceive of the present invention and characteristics, and its purpose is to let the people who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalent transformations that spirit is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
Claims (7)
1. power consumption wireless sensor network system; It is characterized in that; Network node in the said network system comprises that wireless sensor network coordinator module and wireless senser are from node module; Said wireless sensor network coordinator module comprises the first controlled in wireless communication unit, first data processing unit and the first RFDC unit; The low frequency wake-up signal is sent in the control of first wireless communication control unit; The said first RFDC unit is used to intercept the low frequency wake-up confirmation signal; Said first data processing unit is used to control the first controlled in wireless communication unit and the first RFDC unit, and said wireless senser comprises the second controlled in wireless communication unit, second data processing unit and the second RFDC unit from node module, and the second controlled in wireless communication unit is used to intercept low frequency wake-up signal frequency range; The said second RFDC unit is used for transmission and wakes confirmation signal up, and said second data processing unit is used to control the second controlled in wireless communication unit and the second RFDC unit.
2. power consumption wireless sensor network system according to claim 1 is characterized in that, said wireless sensor network coordinator module adopts the power supply power supply, and said wireless senser adopts powered battery from node module.
3. power consumption wireless sensor network system according to claim 1 is characterized in that, the said working frequency range that is used for the low frequency wake-up signal of low frequency wake-up is 125KHz, and the working frequency range of said low frequency wake-up confirmation signal is 2.4GHz.
4. power consumption wireless sensor network system according to claim 1; It is characterized in that; Said wireless senser also comprises the memory cell that is used to store the information of setting from node module; Said memory cell links to each other with the second wireless data processing unit, and said memory cell can be by the second data processing unit access control.
5. the wake-up control method of a power consumption wireless sensor network system is characterized in that, the concrete workflow of said wake-up control method is:
First data processing unit in the wireless sensor network coordinator module is controlled the first controlled in wireless communication unit and is sent the low frequency wake-up signal in order to destination node that wakes communication task up and the timeout mechanism that startup first data processing unit is set, and the first RFDC unit continues to intercept the low frequency wake-up confirmation signal then;
The second controlled in wireless communication unit of wireless senser from node module continues to intercept the low frequency wake-up frequency range and the signal in this frequency range screened; If received low frequency wake-up signal does not meet the appointment requirement; Second data processing unit and the second RFDC unit keep low-power sleep state; If the low frequency wake-up signal meets the appointment requirement; Then start second data processing unit and the second RFDC unit and send and wake confirmation signal up, second data processing unit switches to accepting state and the startup timeout mechanism is set;
The wireless sensor network coordinator module receives in preset time-out time and effectively wakes confirmation signal up, then sends command signal and the startup timeout mechanism is set to destination node through the first RFDC unit;
Wireless senser receives the command signal of sending from the first RFDC unit from the second RFDC unit of node module; Abandon this communication task and return low-power sleep state if time of reception surpassed from the default time of node module, if time of reception is in the default time from node module then second data processing unit starts communication task;
After wireless senser was accomplished communication task from node module, it was listen mode that the second controlled in wireless communication unit is set, and second data processing unit and the second RFDC unit are low power sleep mode.
6. the wake-up control method of power consumption wireless sensor network system according to claim 5 is characterized in that, when the said first controlled in wireless communication unit carries out the transmission of low frequency wake-up signal, closes the first RFDC unit.
7. the wake-up control method of power consumption wireless sensor network system according to claim 5; It is characterized in that; Said low frequency wake-up signal is the device id information that comprises the required destination node that wakes up; Said wireless senser is differentiated the low frequency wake-up signal from the id information of node module bonding apparatus self, and then wakes second data processing unit and the second RFDC unit under it up.
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