CN111328081B - Wireless ad hoc network method - Google Patents
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- CN111328081B CN111328081B CN202010119687.6A CN202010119687A CN111328081B CN 111328081 B CN111328081 B CN 111328081B CN 202010119687 A CN202010119687 A CN 202010119687A CN 111328081 B CN111328081 B CN 111328081B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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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
- H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
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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 wireless ad hoc network method, which comprises the following steps: the wireless access point plans a time slot of a data communication process by using a frequency spectrum resource, executes a corresponding data exchange rule according to the planned time slot, and the wireless node actively initiates a wireless access point discovery instruction or a signal strength inquiry instruction of other wireless access points in a deployment site according to the self state by using a reserved public channel according to the data exchange rule, and executes the corresponding data exchange rule in the planned time slot period according to the discovery instruction or the inquiry instruction actively initiated by the wireless node by the wireless access point, and the wireless node executes a task under a normal condition according to the executed corresponding data exchange rule, and then continues to sleep, or initiates an application to join the wireless access point when detecting the existence of an effective wireless access point in a power saving mode. By the mode, the wireless ad hoc network with low power consumption, wide range and quick response can be realized.
Description
Technical Field
The invention relates to the field of wireless networking, in particular to a wireless ad hoc networking method.
Background
With the rapid development of the technology, in order to reduce the maintenance cost of the product, high requirements are generally put on power consumption.
In an existing wireless ad hoc network scheme, one scheme is to implement a wireless ad hoc network by using a Zigbee (Zigbee protocol) mode, but a node of Zigbee needs a certain time, for example, 30ms (millisecond) from sleeping to accessing a channel, and the power consumption is increased due to slow wakeup time, and communication can be actively initiated by a wireless terminal at any time, which causes channel conflict, so that the time for a coordinator to access the wireless terminal cannot be determined, and Zigbee can achieve low power consumption only in an occasion with low requirement on response delay.
The existing wireless ad hoc network scheme and the other scheme adopt a WIFI (wireless internet access) mode to realize the wireless ad hoc network, but the WIFI is generally applied to a 2.4G frequency band, commercial devices of the frequency band are numerous, the channel pollution is serious, the coverage range is small, and the like, so that the power consumption of the WIFI is very high, and is dozens of times or even hundreds of times of the general low-power-consumption wireless local area network, and the WIFI can not be applied to a low-power-consumption scene.
In the existing wireless ad hoc network scheme, another scheme is to implement wireless ad hoc network in a Narrow Band Internet of Things (NBIOT) manner, which is not only nominally low in power consumption but also does not require networking, but the response speed of terminal access of the NBIOT is at least 1 hour or more when the NBIOT satisfies its nominal power consumption.
In the existing wireless ad hoc network scheme, another scheme is that a Long Range Radio (LORA) mode is used to implement the wireless ad hoc network, and the LORA can implement the Long Range coverage of the wireless ad hoc network with very low average power consumption, but because the LORA adopts a spread spectrum technology, the actual communication rate is very low, and in a kilometer-level coverage Range, the actual communication rate can only be as low as 1kbps (kilobits per second), and in fact, the response speed of the LORA is limited, and it is difficult to achieve fast response and have low power consumption at the same time.
In summary, the existing wireless ad hoc network scheme cannot realize a wireless ad hoc network with low power consumption, wide range and quick response.
Disclosure of Invention
In view of this, an object of the present invention is to provide a wireless ad hoc network method, which can implement a wireless ad hoc network with low power consumption, wide range and fast response.
According to an aspect of the present invention, there is provided a wireless ad hoc network method, including: the wireless access point plans a time slot in a data communication process by using frequency spectrum resources, and executes a corresponding data exchange rule according to the planned time slot; the wireless node actively initiates a wireless access point discovery instruction or a signal strength inquiry instruction of other wireless access points in a deployment site according to the executed corresponding data exchange rule and the self state including an offline or online state period by using a reserved public channel; the wireless access point executes a corresponding data exchange rule in the planned time slot period according to a discovery instruction or an inquiry instruction actively initiated by the wireless node; and the wireless node executes the task under the normal condition according to the executed corresponding data exchange rule, then continues to sleep, or initiates application for joining the wireless access point when detecting the existence of the effective wireless access point under the power-saving mode.
The wireless access point plans a time slot in a data communication process by using frequency spectrum resources, and executes a corresponding data exchange rule according to the planned time slot, wherein the method comprises the following steps: the wireless access point plans a time slot in the data communication process by using frequency spectrum resources in a frequency division multiplexing mode of different frequency bands for data communication, and executes a corresponding data exchange rule according to the planned time slot.
The method for planning the time slot in the data communication process by the wireless access point by using the frequency spectrum resources in a frequency division multiplexing mode of different frequency bands for data communication comprises the following steps: the wireless access point adopts a mode that one wireless access point manages wireless nodes under the same frequency band and different wireless access points manage wireless nodes under different frequency bands to carry out data communication in a frequency division multiplexing mode of different frequency bands, and the time slot in the data communication process is planned by utilizing frequency spectrum resources.
The wireless access point comprises a central processing unit, a Sub-1GHz wireless module and another Sub-1GHz wireless module; the central processing unit is used for controlling the Sub-1GHz wireless module and the Sub-1GHz wireless module to carry out wireless communication, the Sub-1GHz wireless module is used for being responsible for interaction of network data according to the control of the central processing unit, and the other Sub-1GHz wireless module is used for being responsible for communication initiated by the terminal node for network awakening or wireless access point switching.
Wherein, the wireless node actively initiates a wireless access point discovery instruction or a signal strength query instruction of other wireless access points in a deployment site according to the state of the wireless node including an offline or online state period by using a reserved public channel according to the executed corresponding data exchange rule, and the method comprises the following steps: and the wireless node actively initiates a wireless access point discovery instruction according to the executed corresponding data exchange rule and by using a reserved public channel when the self state is the offline state, and initiates an access application to the network where the responded wireless access point is located when the wireless access point responds to the discovery instruction.
Wherein, the wireless node actively initiates a wireless access point discovery instruction or a signal strength query instruction of other wireless access points in a deployment site according to the state of the wireless node including an offline or online state period by using a reserved public channel according to the executed corresponding data exchange rule, and the method comprises the following steps: the wireless node actively initiates a signal strength inquiry instruction of other wireless access points of the deployment site according to the executed corresponding data exchange rule and by using a reserved public channel when the state of the wireless node is an online state, and the wireless node passes through the AP of the other wireless access points n Responding to the query instruction, and extracting the strength value RSSI of the wireless node when receiving the signal n And comparing the signal strength RSSI of the wireless access point where the wireless node is currently located, if RSSI appears<RSSI n + M, M is any value greater than zero, the wireless node will start to leave the network of the current wireless access point and join other wireless access points AP n The network in which it is located.
Wherein, the wireless access point executes a corresponding data exchange rule in the planned time slot cycle according to a discovery instruction or an inquiry instruction actively initiated by the wireless node, and the method comprises the following steps: the wireless access point scans and monitors all frequency bands and autonomously selects an idle data channel according to a discovery instruction or an inquiry instruction actively initiated by the wireless node, sends a broadcast packet during a broadcast time slot, receives the receiving confirmation of the wireless node on a control instruction of the wireless access point during a synchronous time slot, monitors the channel and responds to the wireless node during a competition time slot, processes a network transaction during a silent time slot, prepares the next broadcast period, discovers the network of the wireless node, inquires the signal strength of the wireless access point and responds to a corresponding request of the wireless node during the interception of a common channel.
Wherein, the wireless node executes a task under normal condition according to the executed corresponding data exchange rule, then continues to sleep, or detects the existence of an effective wireless access point under a power saving mode, and initiates application for joining the wireless access point, including: the wireless node scans a wireless access point according to the executed corresponding data exchange rule under normal condition, enters a power saving mode when the wireless access point is not scanned, selects the wireless access point with the strongest signal when the wireless access point is scanned, sends an access application in a competition time slot, fails to enter the power saving mode when the access response of the wireless access point with the strongest signal is not received, succeeds in accessing when the access response of the wireless access point with the strongest signal is received, synchronizes a broadcasting periodic window, sets a wakeup clock to wake up at a preset time before the broadcasting window of each wireless access point arrives, then enters a sleep mode, starts radio frequency reception when the broadcasting window arrives, detects whether the broadcasting packet is received, quits and executes rescanning when the broadcasting packet is not received, analyzes the received broadcasting packet and detects whether the task needs to be executed or not when the broadcasting packet is detected, sets the wakeup clock to enter the sleep mode when the broadcasting packet arrives at the preset time, and then executes the task if the task needs to be executed.
Wherein, the wireless node executes a task under normal condition according to the executed corresponding data exchange rule, then continues to sleep, or detects the existence of an effective wireless access point under a power saving mode, and initiates application for joining the wireless access point, including: and the wireless node closes each functional module of the system and sets timing wake-up time in a power-saving mode according to the executed corresponding data exchange rule, inquires whether a wireless access point exists nearby in a public channel when the wake-up time is up, continues to sleep when the wireless access point does not exist nearby when the wireless access point is inquired by the public channel, and initiates application for joining the wireless access point when the wireless access point exists nearby when the wireless access point is inquired by the public channel.
The wireless node comprises another central processing unit and a Sub-1GHz wireless module; the other central processing unit is used for controlling the other Sub-1GHz wireless module to carry out wireless communication, and the other Sub-1GHz wireless module is used for being responsible for communication initiated by the terminal node for network awakening or wireless node switching according to the control of the other central processing unit.
It can be found that, in the above solution, the wireless access point may plan a time slot of a data communication process by using a spectrum resource, and execute a corresponding data exchange rule according to the planned time slot, and the wireless node may actively initiate a discovery instruction of the wireless access point or a signal strength query instruction of other wireless access points in a deployment site according to its own state including an offline or online state cycle by using a reserved common channel according to the executed corresponding data exchange rule, and the wireless access point may execute the corresponding data exchange rule in the planned time slot cycle according to the discovery instruction or the query instruction actively initiated by the wireless node, and the wireless node may execute a task under a normal condition according to the executed corresponding data exchange rule and then continue to sleep, or detect the existence of a valid wireless access point in a power saving mode, and initiate an application for joining the wireless access point, thereby being capable of implementing a wireless ad hoc network with low power consumption, wide range, and fast response.
Further, according to the above scheme, the wireless access point may plan a time slot in the data communication process by using spectrum resources in a frequency division multiplexing manner of different frequency bands for data communication, and execute a corresponding data exchange rule according to the planned time slot, so that the whole communication time is controlled and determined, thereby ensuring the response time of communication and low power consumption of the wireless node.
Furthermore, according to the scheme, the wireless access point can adopt a mode that one wireless access point manages wireless nodes under the same frequency band and different wireless access points manage wireless nodes under different frequency bands to carry out frequency division multiplexing of different frequency bands on data communication, and the time slot in the data communication process is planned by using frequency spectrum resources.
Further, according to the above scheme, the wireless access point may include a central processing unit, a Sub-1GHz wireless module and another Sub-1GHz wireless module; the central processing unit can control the Sub-1GHz wireless module and the Sub-1GHz wireless module to carry out wireless communication, the Sub-1GHz wireless module can be responsible for interaction of network data according to the control of the central processing unit, the other Sub-1GHz wireless module can be responsible for communication initiated by the terminal node for network awakening or wireless access point switching according to the control of the central processing unit, and the advantage is that wide-range wireless ad hoc network covering the industrial, scientific and medical frequency bands of Sub-1G can be realized, and one network can support more than one node.
Further, according to the above scheme, the wireless node may actively initiate a wireless access point discovery instruction according to the executed corresponding data exchange rule by using a reserved common channel when the state of the wireless node is an offline state, and initiate a network access application to a network where the wireless access point responding to the discovery instruction exists when the wireless access point responds to the discovery instruction.
Further, according to the above scheme, the wireless node may utilize the reserved common channel according to the executed corresponding data exchange rule, and when the state of the wireless node is the online state, the wireless node actively initiates a signal strength query instruction of other wireless access points of the deployment site, and through the other wireless access points, the AP n Responding to the inquiry command, and extracting the strength value RSSI of the received signal of the wireless node n And comparing the signal strength RSSI of the wireless access point where the wireless node is currently located, if RSSI appears<RSSI n + M, M means any value greater than zero,the wireless node will start the network departing from the current wireless access point and join other wireless access points n The network has the advantage that the wireless node can keep low power consumption in a long-term offline state.
Further, according to the above scheme, the wireless access point may scan and listen to all frequency bands and autonomously select an idle data channel according to a discovery command or an inquiry command actively initiated by the wireless node, transmit a broadcast packet during a broadcast time slot, receive a reception confirmation of a control command of the wireless access point from the wireless node during a synchronization time slot, listen to the channel and respond to the wireless node during a contention time slot, process a network transaction during a silent time slot, prepare a next broadcast period, discover a network of the wireless node and query a signal strength of the wireless access point and respond to a corresponding request of the wireless node during listening to a common channel.
Further, according to the above scheme, the wireless node may scan the wireless access point according to the executed corresponding data exchange rule, under a normal condition, enter a power saving mode when no wireless access point is scanned, select the wireless access point with the strongest signal when the wireless access point is scanned, send an access application in a contention time slot, fail to enter the power saving mode when no access response associating the access application with the wireless access point with the strongest signal is received, succeed in accessing when the access response associating the access application with the wireless access point with the strongest signal is received, synchronize a broadcast cycle window, and set a wakeup clock to wake up by a preset time before the broadcast window of each wireless access point arrives, then enter a sleep mode, and when the broadcast window arrives, turn on radio frequency reception, and detect whether a broadcast packet is received, when it is detected that no broadcast packet is received, go off the network and execute a rescan wireless access point again, when it is detected that a received broadcast packet is received, analyze the received broadcast packet, and detect whether a task needs to be executed, when it is detected that the task is not received by the broadcast packet, it is a task that the wake up time is needed to enter a sleep mode, and then it is a task to be executed, and it is advantageous that it is possible to continue to execute a task before it is detected that the wake up a task.
Further, according to the above solution, the wireless node may close each functional module of the system in a power saving mode and set a timing wake-up time according to the executed corresponding data exchange rule, when the wake-up time is up, query whether a wireless access point exists nearby in the public channel, when the wireless access point does not exist nearby in the public channel, continue to sleep, and when the wireless access point exists nearby in the public channel, initiate an application to join the wireless access point, which is advantageous in that low power consumption, wide range and fast response of the wireless ad hoc network can be ensured.
Further, according to the above scheme, the wireless node may include another central processing unit, and another Sub-1GHz wireless module; the other central processor can control the other Sub-1GHz wireless module to carry out wireless communication, and the other Sub-1GHz wireless module can be responsible for communication initiated by the terminal node for network awakening or wireless node switching according to the control of the other central processor, so that the advantages that the wide-range wireless ad hoc network covering the industrial, scientific and medical frequency bands of Sub-1G can be realized, and one network can support more than one node can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart illustrating a wireless ad hoc network method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a wireless access point of the present invention;
fig. 3 is a schematic structural diagram of a wireless node according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and examples. It is to be noted that the following examples are only illustrative of the present invention, and do not limit the scope of the present invention. Similarly, the following examples are only some but not all examples of the present invention, and all other examples obtained by those skilled in the art without any inventive work are within the scope of the present invention.
The invention provides a wireless ad hoc network method, which can realize wireless ad hoc network with low power consumption, wide range and quick response.
Referring to fig. 1, fig. 1 is a flowchart illustrating a wireless ad hoc network method according to an embodiment of the present invention. It should be noted that the method of the present invention is not limited to the flow sequence shown in fig. 1 if the results are substantially the same. As shown in fig. 1, the method comprises the steps of:
s101: an AP (Wireless Access Point) plans a time slot in a data communication process by using a spectrum resource, and executes a corresponding data exchange rule according to the planned time slot.
The method for the wireless access point to plan the time slot in the data communication process by using the spectrum resource, and according to the planned time slot, executing the corresponding data exchange rule may include:
the wireless access point plans a time slot in the data communication process by using frequency spectrum resources in a frequency division multiplexing mode of different frequency bands for data communication, and executes a corresponding data exchange rule according to the planned time slot.
The method for planning the time slot in the data communication process by using the frequency spectrum resource by the wireless access point in a frequency division multiplexing mode of different frequency bands for data communication may include:
the wireless access point adopts a mode that one wireless access point manages wireless nodes under the same frequency band and different wireless access points manage wireless nodes under different frequency bands to carry out data communication in a frequency division multiplexing mode of different frequency bands, and utilizes frequency spectrum resources to plan a time slot in the data communication process.
In this embodiment, the data communication process time slots can be planned in time sequence by using the spectrum resources, such as broadcast time slots, synchronization time slots, contention time slots and silence time slots.
In this embodiment, the broadcast timeslot is a preset fixed time starting from a periodic broadcast packet of the wireless access point, and to ensure low power consumption, the time synchronization of the entire network is performed, and the synchronization timeslot, the contention timeslot, and the silence timeslot all use the timeslot as a starting point.
In this embodiment, the Node in the network entry state may open a receiving window at the beginning of each AP broadcast slot, where the receiving window is short, such as several milliseconds, but is enough time to obtain the AP instruction. Since the reception window is short, the average power consumption in the period of one AP broadcast slot is very small.
In this embodiment, the broadcast slot is used for sending an instruction, and can also synchronize the local clock of the Node, because the broadcast period of the AP is relatively short, for example, 1000ms, the Node can periodically calibrate its own time, so the timing time accuracy of the Node does not need to be very high, and the accuracy of < =1000ppm (parts per million) can meet the requirement in the application.
In this embodiment, in the broadcast packet, the AP may piggyback a control command to one or more nodes in the network, and the response of the Node may be placed in the synchronization slot.
In this embodiment, the synchronization slot is used for Node to Acknowledge (ACK) reception of the AP control command immediately after the AP completes broadcasting, the length of the synchronization slot may be variable, in each broadcasting cycle, a time slot with variable length may be reserved according to the number of commands carried by the AP, and each Node receiving a command replies to the AP sequentially in this time slot.
In this embodiment, the contention slot may also be considered for uploading some information of the Node itself, such as Node network access application and low power consumption of the Node, so as to introduce a contention timing sequence. In the competition time slot, all Node positions compete for the same channel equally, and a random collision detection and collision avoidance mechanism is adopted, so that the power consumption improvement and time loss of nodes caused by the fact that the nodes compete for the channel mutually are reduced.
In this embodiment, the silent slot refers to a period of silent period reserved before the end of each broadcast period, and may be a period of processing time reserved for the AP to process some events in this broadcast period.
In this embodiment, the AP may serve as a manager of the wireless network and a main initiator of communication, and is configured to receive a remote instruction from the server, and issue and monitor an execution status of the managed wireless node; meanwhile, the system is responsible for maintaining the whole network, including network awakening, network access application, data exchange and the like of the nodes.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a wireless access point according to an embodiment of the present invention. As shown in fig. 2, the wireless access point 20 includes a Central Processing Unit (CPU) 21, a Sub-1GHz (radio frequency less than 1 GHz) wireless module 22, and another Sub-1GHz wireless module 23; the central processing unit 21 is configured to control the one Sub-1GHz wireless module 22, the other Sub-1GHz wireless module 22 to perform wireless communication, the one Sub-1GHz wireless module 22 is configured to be responsible for interaction of network data according to the control of the central processing unit 21, and the other Sub-1GHz wireless module 23 is configured to be responsible for communication initiated by the terminal node for network wakeup or handover of a radio access point according to the control of the central processing unit 21, so that the wide-range wireless ad hoc network covering the ISM (Industrial Scientific Medical) frequency band of Sub-1G can be implemented, and one network can support more than one node.
S102: the wireless node actively initiates a wireless access point discovery instruction or a signal strength inquiry instruction of other wireless access points in a deployment site according to the executed corresponding data exchange rule, a reserved public channel and the self state including an offline or online state period.
Wherein, the wireless node actively initiates a wireless access point discovery instruction or a signal strength query instruction of other wireless access points in a deployment site according to the executed corresponding data exchange rule, by using a reserved common channel and according to the state of the wireless node including an offline or online state period, and may include:
the wireless node actively initiates a wireless access point discovery instruction according to the executed corresponding data exchange rule and by using a reserved public channel when the self state is the offline state, and initiates an access application to the network where the responding wireless access point is located when the wireless access point responds to the discovery instruction.
Wherein, the wireless node actively initiates a wireless access point discovery instruction or a signal strength query instruction of other wireless access points in a deployment site according to the executed corresponding data exchange rule, by using a reserved common channel and according to the state of the wireless node including an offline or online state period, and may include:
the wireless node uses the reserved public channel according to the executed corresponding data exchange rule, when the state of the wireless node is an online state, the wireless node actively initiates a signal intensity inquiry instruction of other wireless access points of a deployment site, and the wireless node passes through other wireless access points AP n Responding to the inquiry command and extracting the strength value RSSI when the wireless node receives the signal n And comparing the signal strength RSSI of the wireless access point where the wireless node is currently located, if RSSI appears<RSSI n + M, M meansIf any value is larger than zero, the wireless node starts the network which is separated from the current wireless access point and joins other wireless access points AP n The network has the advantage that the wireless node can keep low power consumption in a long-term offline state.
In the embodiment, the principles of frequency division multiplexing and time division multiplexing can be generally adopted to manage the wireless local area network of the whole site.
In this embodiment, a star topology may be adopted in combination with a cell system, different frequency bands, that is, frequency division multiplexing, may be adopted for data communication between APs, and one AP may manage nodes in the same frequency band. The space covered by signals among the APs can be mutually overlapped without mutual interference, and then multi-AP deployment of a field is realized.
In this embodiment, each AP may have two channels, one is a data channel and a private channel, for implementing command control and execution feedback of the AP and the Node; the other is a common channel of all APs, for example, 0 channel, which is used for AP discovery and network wakeup of the Node.
In this embodiment, each cell AP network uses spectrum resources in a time division multiplexing manner, and in order to ensure low power consumption and fast response, the AP broadcasts periodically at a timing, and in two broadcast periods, information exchange between nodes and APs is implemented by dividing different time slots and specifying characteristics of different time slots.
In this embodiment, it can be realized that the Node can maintain very low power consumption in a long-term off-line state, which is an important function for the application of pre-installed battery when leaving factory, and a network wake-up function is designed for this purpose. When the Node enters the coverage area of the AP signal, the Node automatically wakes up and tries to access the network. Meanwhile, the Node can autonomously switch to other APs with stronger coverage signals under the condition of finding out that the signals of the located APs are weak.
S103: and the wireless access point executes a corresponding data exchange rule in the planned time slot period according to the discovery instruction or the inquiry instruction actively initiated by the wireless node.
The method for implementing the corresponding data exchange rule in the planned timeslot period by the wireless access point according to the discovery instruction or the query instruction actively initiated by the wireless node may include:
the wireless access point scans and monitors all frequency bands and autonomously selects an idle data channel according to a discovery command or an inquiry command actively initiated by the wireless node, sends a broadcast packet during a broadcast time slot, receives the receiving confirmation of the wireless node to the control command of the wireless access point during a synchronous time slot, monitors the channel and responds to the wireless node during a competition time slot, processes a network transaction during a silent time slot, prepares the next broadcast period, discovers the network of the wireless node, inquires the signal strength of the wireless access point and responds to the corresponding request of the wireless node during the interception of a common channel, and has the advantages of realizing the controlled and determined time of the whole communication and further ensuring the response time of the communication and the low power consumption of the wireless node.
S104: the wireless node executes the task under the normal condition according to the executed corresponding data exchange rule, then continues to sleep, or detects the existence of the effective wireless access point under the power-saving mode, and initiates the application to join the wireless access point.
The wireless node executes a task under a normal condition according to the executed corresponding data exchange rule, and then continues to sleep, or initiates an application to join the wireless access point when detecting the existence of an effective wireless access point under a power saving mode, which may include:
the wireless node scans the wireless access point according to the executed corresponding data exchange rule under normal condition, enters a power saving mode when the wireless access point is not scanned, selects the wireless access point with the strongest signal when the wireless access point is scanned, sends an access application in a competition time slot, fails to enter the power saving mode when the access response of the wireless access point with the strongest signal associated with the access application is not received, succeeds in accessing when the access response of the wireless access point with the strongest signal associated with the access application is received, synchronizes with a broadcast period window and sets an RTC (real time clock)
A (Real _ Time Clock) wakes up a preset Time before a broadcast window of each wireless access point arrives, and then enters a sleep state, and starts RF (Radio Frequency) reception and detects whether a broadcast packet is received when the broadcast window arrives, goes off-line and performs rescanning of the wireless access points when it is detected that the broadcast packet is not received, parses the received broadcast packet when it is detected that the broadcast packet is received, and detects whether a task needs to be performed, sets a wake-up Clock to wake up a preset Time before the broadcast window of each wireless access point arrives and then enters a sleep state when it is detected that the task needs to be performed, performs the task and then continues the sleep state, which is advantageous in that it is possible to secure low power consumption, wide range, and fast response of the wireless ad hoc network.
Wherein, the wireless node executes the task under normal condition according to the executed corresponding data exchange rule, and then continues to sleep, or detects the existence of the effective wireless access point under the power saving mode, and then initiates an application for joining the wireless access point, which may include:
the wireless node closes each functional module of the system and sets timing wake-up time under the power-saving mode according to the executed corresponding data exchange rule, when the wake-up time is up, whether a wireless access point exists nearby is inquired on a public channel, when the wireless access point does not exist nearby is inquired on the public channel, the wireless node continues sleeping, and when the wireless access point exists nearby is inquired on the public channel, the wireless node initiates application to join the wireless access point.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a wireless node according to an embodiment of the present invention. As shown in fig. 3, the wireless node 30 includes another Central Processing Unit (CPU) 31, a Sub-1GHz wireless module 32; the other central processing unit 31 is used for controlling the other Sub-1GHz wireless module 32 to perform wireless communication, and the other Sub-1GHz wireless module 32 is used for controlling the other central processing unit 31 to be responsible for communication initiated by the terminal node for network wakeup or wireless node switching, so that the wireless ad hoc network which covers the industrial, scientific and medical frequency bands of Sub-1G in a wide range and can support more than one node in one network can be realized.
It can be found that, in the above solution, the wireless access point may plan a time slot of a data communication process by using a spectrum resource, and execute a corresponding data exchange rule according to the planned time slot, and the wireless node may actively initiate a discovery instruction of the wireless access point or a signal strength query instruction of other wireless access points in a deployment site according to its own state including an offline or online state cycle by using a reserved common channel according to the executed corresponding data exchange rule, and the wireless access point may execute the corresponding data exchange rule in the planned time slot cycle according to the discovery instruction or the query instruction actively initiated by the wireless node, and the wireless node may execute a task under a normal condition according to the executed corresponding data exchange rule and then continue to sleep, or detect the existence of a valid wireless access point in a power saving mode, and initiate an application for joining the wireless access point, thereby being capable of implementing a wireless ad hoc network with low power consumption, wide range, and fast response.
Further, according to the above scheme, the wireless access point may plan a time slot in the data communication process by using spectrum resources in a frequency division multiplexing manner of different frequency bands for data communication, and execute a corresponding data exchange rule according to the planned time slot, so that the whole communication time is controlled and determined, thereby ensuring the response time of communication and low power consumption of the wireless node.
Furthermore, according to the scheme, the wireless access point can adopt a frequency division multiplexing mode that one wireless access point manages wireless nodes under the same frequency band and different wireless access points manage wireless nodes under different frequency bands to carry out data communication through different frequency bands, and a time slot in the data communication process is planned by using frequency spectrum resources.
Further, in the above solution, the wireless access point may include a central processing unit, a Sub-1GHz wireless module and another Sub-1GHz wireless module; the central processing unit can control the Sub-1GHz wireless module and the Sub-1GHz wireless module to carry out wireless communication, the Sub-1GHz wireless module can be in charge of interaction of network data according to the control of the central processing unit, the other Sub-1GHz wireless module can be in charge of communication initiated by the terminal node for realizing network awakening or switching of the wireless access point according to the control of the central processing unit, and the advantage is that the wide-range wireless ad hoc network covering the industrial, scientific and medical frequency bands of Sub-1G can be realized, and one network can support more than one node.
Further, according to the above scheme, the wireless node may actively initiate a wireless access point discovery instruction according to the executed corresponding data exchange rule by using a reserved common channel when the state of the wireless node is an offline state, and initiate a network access application to a network where the wireless access point responding to the discovery instruction exists when the wireless access point responds to the discovery instruction.
Further, according to the above scheme, the wireless node may use a reserved common channel according to the executed corresponding data exchange rule, and when the state of the wireless node is an online state, the wireless node actively initiates a signal strength query instruction for deploying other wireless access points of the site, and through the other wireless access points, the AP n Responding to the inquiry command, and extracting the strength value RSSI of the received signal of the wireless node n And comparing the signal strength RSSI of the wireless access point where the wireless node is currently located, if RSSI appears<RSSI n + M, M is any value greater than zero, the wireless node will start to leave the network of the current wireless access point and join other wireless access points AP n The network in which the mobile communication device is located,this has the advantage that the wireless node can maintain low power consumption even in a long-term off-line state.
Further, according to the above scheme, the wireless access point may scan and listen to all frequency bands and autonomously select an idle data channel according to a discovery command or an inquiry command actively initiated by the wireless node, transmit a broadcast packet during a broadcast time slot, receive a reception confirmation of a control command of the wireless access point from the wireless node during a synchronization time slot, listen to the channel and respond to the wireless node during a contention time slot, process a network transaction during a silent time slot, prepare a next broadcast period, discover a network of the wireless node and query a signal strength of the wireless access point and respond to a corresponding request of the wireless node during listening to a common channel.
Further, according to the above scheme, the wireless node may scan the wireless access point according to the executed corresponding data exchange rule, under a normal condition, enter a power saving mode when no wireless access point is scanned, select the wireless access point with the strongest signal when the wireless access point is scanned, send an access application in a contention time slot, fail to enter the power saving mode when no access response associating the access application with the wireless access point with the strongest signal is received, succeed in accessing when the access response associating the access application with the wireless access point with the strongest signal is received, synchronize a broadcast cycle window, and set a wakeup clock to wake up by a preset time before the broadcast window of each wireless access point arrives, then enter a sleep mode, and when the broadcast window arrives, turn on radio frequency reception, and detect whether a broadcast packet is received, when it is detected that no broadcast packet is received, go off the network and execute a rescan wireless access point again, when it is detected that a received broadcast packet is received, analyze the received broadcast packet, and detect whether a task needs to be executed, when it is detected that the task is not received by the broadcast packet, it is a task that the wake up time is needed to enter a sleep mode, and then it is a task to be executed, and it is advantageous that it is possible to continue to execute a task before it is detected that the wake up a task.
Further, according to the above scheme, the wireless node may close each functional module of the system and set a timing wake-up time in the power saving mode according to the executed corresponding data exchange rule, when the wake-up time is up, query whether a wireless access point exists nearby in the public channel, when the wireless access point does not exist nearby in the public channel, continue to sleep, and when the wireless access point exists nearby in the public channel, initiate an application for joining the wireless access point, which is advantageous in that low power consumption, wide range and fast response of the wireless ad hoc network can be ensured.
Further, according to the above scheme, the wireless node may include another central processing unit, and another Sub-1GHz wireless module; the other central processor can control the other Sub-1GHz wireless module to carry out wireless communication, and the other Sub-1GHz wireless module can be responsible for communication initiated by the terminal node for network awakening or wireless node switching according to the control of the other central processor, so that the advantages that the wide-range wireless ad hoc network covering the industrial, scientific and medical frequency bands of Sub-1G can be realized, and one network can support more than one node can be realized.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a module or a unit is only one type of logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be substantially or partially implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only a part of the embodiments of the present invention, and not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes performed by the contents of the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are all included in the scope of the present invention.
Claims (10)
1. A wireless ad hoc networking method, comprising:
the wireless access point plans a time slot in a data communication process by utilizing frequency spectrum resources, and executes a corresponding data exchange rule according to the planned time slot;
the wireless node actively initiates a wireless access point discovery instruction or a signal strength inquiry instruction of other wireless access points in a deployment site according to the executed corresponding data exchange rule and the self state including an offline or online state period by using a reserved public channel;
the wireless access point executes a corresponding data exchange rule in the planned time slot period according to a discovery instruction or an inquiry instruction actively initiated by the wireless node;
and the wireless node executes a task under a normal condition according to the executed corresponding data exchange rule, then continues to sleep, or initiates application to join the wireless access point when detecting the existence of an effective wireless access point under a power-saving mode.
2. The wireless ad-hoc network method of claim 1, wherein the wireless access point utilizes spectrum resources to plan a time slot for data communication process, and executes corresponding data exchange rules according to the planned time slot, comprising:
the wireless access point plans a time slot in the data communication process by using frequency spectrum resources in a frequency division multiplexing mode of different frequency bands for data communication, and executes a corresponding data exchange rule according to the planned time slot.
3. The wireless ad-hoc network method of claim 2, wherein the wireless access point plans the time slot of the data communication process by using spectrum resources in a frequency division multiplexing mode of data communication through different frequency bands, comprising:
the wireless access point adopts a mode that one wireless access point manages wireless nodes under the same frequency band and different wireless access points manage wireless nodes under different frequency bands to carry out data communication in a frequency division multiplexing mode of different frequency bands, and the time slot in the data communication process is planned by utilizing frequency spectrum resources.
4. The wireless ad-hoc networking method of claim 1, wherein said wireless access point comprises a central processor, a Sub-1GHz wireless module and another Sub-1GHz wireless module; the central processing unit is used for controlling the Sub-1GHz wireless module and the other Sub-1GHz wireless module to carry out wireless communication, the Sub-1GHz wireless module is used for being responsible for interaction of network data according to the control of the central processing unit, and the other Sub-1GHz wireless module is used for being responsible for communication initiated by the terminal node for network awakening or wireless access point switching.
5. The wireless ad-hoc network method of claim 1, wherein the wireless node actively initiates a wireless access point discovery command or a signal strength query command of other wireless access points of a deployment site according to its own status including off-line or on-line status period by using a reserved common channel according to the executed corresponding data exchange rule, comprising:
and the wireless node actively initiates a wireless access point discovery instruction according to the executed corresponding data exchange rule and by using a reserved public channel when the self state is the offline state, and initiates an access application to the network where the responded wireless access point is located when the wireless access point responds to the discovery instruction.
6. The wireless ad-hoc network method of claim 5, wherein the wireless node actively initiates a wireless access point discovery command or a signal strength query command of other wireless access points of a deployment site according to its own status including off-line or on-line status period by using a reserved common channel according to the executed corresponding data exchange rule, comprising:
the wireless node actively initiates a signal strength inquiry instruction of other wireless access points of the deployment site according to the executed corresponding data exchange rule and by using a reserved public channel when the state of the wireless node is an online state, and the wireless node passes through the AP of the other wireless access points n Responding to the query instruction, and extracting the strength value RSSI of the wireless node when receiving the signal n And comparing the signal strength RSSI of the wireless access point where the wireless node is currently located, if RSSI appears<RSSI n + M, M is any value greater than zero, the wireless node will start to leave the network of the current wireless access point and join other wireless access points AP n The network in which it is located.
7. The wireless ad hoc network method of claim 1, wherein the wireless access point executes a corresponding data exchange rule in the planned time slot period according to a discovery command or an inquiry command actively initiated by the wireless node, comprising:
the wireless access point scans and monitors all frequency bands and autonomously selects an idle data channel according to a discovery instruction or an inquiry instruction actively initiated by the wireless node, sends a broadcast packet during a broadcast time slot, receives the receiving confirmation of the wireless node on a control instruction of the wireless access point during a synchronous time slot, monitors the channel and responds to the wireless node during a competition time slot, processes a network transaction during a silent time slot, prepares the next broadcast period, discovers the network of the wireless node, inquires the signal strength of the wireless access point and responds to a corresponding request of the wireless node during the interception of a common channel.
8. The wireless ad-hoc network method of claim 1, wherein the wireless node performs a task under normal conditions according to the executed corresponding data exchange rule, then continues to sleep, or detects the existence of a valid wireless access point under a power saving mode, and then initiates an application for joining the wireless access point, comprising:
the wireless node scans wireless access points according to the executed corresponding data exchange rules under normal conditions, enters a power saving mode when the wireless access points are not scanned, selects the wireless access point with the strongest signal when the wireless access points are scanned, sends an access application in a competition time slot, fails to enter the power saving mode when the access response of the wireless access point with the strongest signal associated with the access application is not received, succeeds in network access when the access response of the wireless access point with the strongest signal associated with the access application is received, synchronizes with a broadcast periodic window, and sets a wakeup clock to wake up at a preset time before the broadcast window of each wireless access point arrives and then enters a sleep mode, starts radio frequency reception when the broadcast window arrives and detects whether the broadcast packet is received or not, goes off the network and executes rescan access point when the broadcast packet is not received, analyzes the received broadcast packet and detects whether the task needs to be executed or not when the broadcast packet is detected, sets the wakeup clock to enter the sleep time before the access point arrives and then detects that the task needs to be executed, and executes the task if the task needs to be executed.
9. The wireless ad-hoc network method of claim 1, wherein the wireless node performs a task under normal conditions according to the executed corresponding data exchange rule, then continues to sleep, or detects the existence of a valid wireless access point under a power saving mode, and then initiates an application for joining the wireless access point, comprising:
and the wireless node closes each functional module of the system and sets timing wake-up time in a power-saving mode according to the executed corresponding data exchange rule, inquires whether a wireless access point exists nearby in a public channel when the wake-up time is up, continues to sleep when the public channel inquires that the wireless access point does not exist nearby, and initiates application for joining the wireless access point when the public channel inquires that the wireless access point exists nearby.
10. The wireless ad-hoc networking method of claim 1, wherein said wireless node comprises another central processor, a further Sub-1GHz wireless module; the other central processing unit is used for controlling the other Sub-1GHz wireless module to carry out wireless communication, and the other Sub-1GHz wireless module is used for being responsible for communication initiated by the terminal node for network awakening or wireless node switching according to the control of the other central processing unit.
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