WO2010143756A2 - Système de réseaux de capteurs zigbee en mode de non-radiobalise pour une faible puissance consommée et procédé de communication de réseau associé - Google Patents

Système de réseaux de capteurs zigbee en mode de non-radiobalise pour une faible puissance consommée et procédé de communication de réseau associé Download PDF

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WO2010143756A2
WO2010143756A2 PCT/KR2009/003064 KR2009003064W WO2010143756A2 WO 2010143756 A2 WO2010143756 A2 WO 2010143756A2 KR 2009003064 W KR2009003064 W KR 2009003064W WO 2010143756 A2 WO2010143756 A2 WO 2010143756A2
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parent node
node
child
time
child node
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WO2010143756A3 (fr
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Jin Sung Cho
Sang Ha Park
Dae-Young Kim
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Kyung Hee University
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Kyung Hee University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] 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
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • 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

Definitions

  • the present invention relates to a non-beacon mode low-power ZigBee sensor network system and network communication method thereof. More particularly, the present invention relates to a non-beacon mode low-power ZigBee sensor network system and network communication method thereof, which realizes low power communication through reduction in wake-up time of a parent node constituting a ZigBee sensor network system.
  • ZigBee is provided for Wireless Personal Area Networks (WPANs) and is recognized as an optimal technology for establishing a low-power and very low-cost network.
  • WPANs Wireless Personal Area Networks
  • ZigBee will become a core technology in applications such as office automation, factory automation, home networks, and the like.
  • ZigBee will be useful as a sensor network solution built not only in homes or indoors, but also in various regions where environmental changes, such as forest fires, disasters, and the like, are difficult to monitor in person.
  • ZigBee devices operate based on battery power. Accordingly, the most important factor in the sensor network is low power consumption.
  • ZigBee is a standard newly defined from a network layer by introduction of the Physical Layer (PHY) Protocol and the Medium Access Control (MAC) layer of the Institute of Electrical and Electronic Engineers (IEEE) 802.15.4 standard.
  • PHY Physical Layer
  • MAC Medium Access Control
  • the ZigBee standard has a stack architecture that comprises an application layer, a network layer, the MAC layer, and the PHY layer.
  • the PHY layer is defined according to the IEEE 802.15.4 standard and provides an interface between the MAC layer and physical channels through RF firmware and RF hardware.
  • the PHY layer uses the 2.4 GHz band, the 869 MHz band and the 915 MHz band, and supports Offset Quadrature Phase Shift Keying (OQPSK) modulations/demodulation.
  • the PHY layer is responsible for activation and deactivation of radio transceivers, energy detection for selected channels, allocation of channel frequency, data transmission/reception, and the like.
  • the MAC layer is also defined according to the IEEE 802.15.4 standard, controls and handles all of the physical channels, and is responsible for channel connection.
  • the network layer builds up a network of the star, cluster-tree or mesh topology, and serves to select a data transmission path between devices.
  • the application layer provides an Application Programming Interface (API) between the network layer and the application layer to control ZigBee devices or application devices defined by users.
  • API Application Programming Interface
  • the devices for ZigBee communication can be classified according to function or performance.
  • the ZigBee devices can be classified into a Full Function Device (FFD) and a Reduced Function Device (RFD).
  • the full function device (FFD) can function as a ZigBee coordinator, ZigBee router, and ZigBee terminal device.
  • the FFD supports all of network topologies, such as star topology, peer-to-peer topology, and cluster-tree topology.
  • the ZigBee devices can be classified into a coordinator, a router, and a terminal device.
  • a single coordinator is provided to each network and forms the root of the network.
  • the router is a full function device (FFD) component of a ZigBee network and acts to temporarily pass data from other devices.
  • FFD full function device
  • the terminal device is generally constituted by the reduced function device (RFD) and cannot act as the coordinator or the router. Rather, the terminal device can perform very simple functions and supports a limited protocol function.
  • RFID reduced function device
  • the classification of the ZigBee devices is directed to reduction in implementation costs. Particularly, since the terminal device is implemented most frequently, it is designed to provide only an essential function without any other functions in order to reduce a price thereof as much as possible.
  • the coordinator and the router are parent nodes with respect to the terminal device, and the terminal device is a child node with respect to the coordinator or the router. Further, the router becomes a child node with respect to the coordinator and becomes a parent node with respect to the terminal device. Particularly, the terminal device only functions as the child node without a function of allocating a network address, which is a function of the parent node.
  • the ZigBee network generally operates in two modes, that is, a beacon mode and a non-beacon mode.
  • the beacon mode network nodes are synchronized by a periodic beacon message.
  • the non-beacon mode network however, the periodic beacon message is not used. Since the non-beacon mode network does not require construction of a superframe with transmission and reception of the periodic beacon, it can be established more simply. Since the topologies or configurations of the beacon mode network and the superframe are not directly related to the present invention and are well known to those skilled in the art, a detailed description thereof will be omitted herein.
  • Figs. 1(a) and 1(b) show data transmission procedures in a conventional non-beacon mode network.
  • Fig. 1(a) shows a data transmission procedure from a child node 20 to a parent node 100
  • Fig. 1(b) shows a data transmission procedure from the parent node 10 to the child node 10.
  • Fig. 1(a) since the parent node 10 operates in a wake-up state in the conventional non-beacon mode network, data is directly transmitted (sent) from the child node 20 to the parent node 10 without an acknowledgement or separate operation if there is a need for data transmission from the child node 20. Then, the parent node 10 transmits to the child node 20 an acknowledgement message (Ack) which indicates the reception of data transmitted from the child node 20.
  • Ack acknowledgement message
  • the parent node 10 cannot send data if there is no polling request (Poll) from the child node even in the case where there is a need for data transmission to the child node 20.
  • the parent node 10 receives the polling request and transmits an acknowledgement message (Ack) to the child node 20. Further, the parent node 10 transmits data to the child node 20. Then, the child node 20 transmits to the parent node 10 an acknowledgement message (Ack) which indicates the reception of the data transmitted from the parent node 10.
  • the aforementioned non-beacon mode network has a simpler network architecture than the beacon network and does not require the nodes to be maintained in a wake-up state or synchronized for periodic processing of the beacon message. However, since it is necessary to guarantee responses to the periodic polling request and random data transmission from the child node, the non-beacon mode network must await data reception in the wake-up state. This will be described in more detail with reference to Fig. 2.
  • the parent node in order to respond to a periodic polling request having a predetermined interval I and random data transmission from the child node, the parent node must be maintained in the wake-up state. This is very inefficient in view of power consumption. Further, this requirement causes asymmetrical power consumption between the parent node and the child node. In other words, the parent node uses more power than the child node. Such asymmetrical power consumption between the parent node and the child node can lead to unstable network connectivity. Accordingly, there is a need for a non-beacon mode low-power network that enables symmetrical power consumption between the parent node and the child node, thereby reducing network power consumption.
  • the present invention is conceived to solve the problems of the related art and an aspect of the present invention is to provide a non-beacon mode low-power ZigBee sensor network system and network communication method thereof, which can overcome the problems of the related art.
  • Another aspect of the present invention is to provide a non-beacon mode low-power ZigBee sensor network system and network communication method thereof, which can reduce power consumption.
  • a further aspect of the present invention is to provide a non-beacon mode low-power ZigBee sensor network system and network communication method thereof, which can prevent or minimize network instability.
  • a network communication method between a parent node and a child node constituting a non-beacon mode ZigBee sensor network system which includes: providing, by the child node, polling interval information to the parent node if there is a request from the child node for network participation; and performing, by the parent node, network communication with the child node in a way of maintaining a wake-up state only at a time point of a polling request from the child node while maintaining a sleep state for a remaining period by determining the time point of the polling request from the child node based on the polling interval information.
  • the parent node may frame and update a time table based on the polling interval information of the child node, and determine whether the parent node enters the wake-up state or the sleep state based on the time table, the time table including first time information including information of an elapsed time from a time point of a last issued polling request to a current wake-up time point and second time information including information of a remaining period from the current wake-up time point to a next predicted polling request of the child node.
  • Framing and updating the time table may be carried out in the wake-up state of the parent node.
  • the polling interval information of the child node may be transferred to the parent node by being embedded in an MLME-ASSOCIATE.request message issued for the network participation of the child node from a higher layer of a Media Access Control (MAC) layer of the child node, and the parent node may obtain the polling interval information of the child node while processing an MLME-ASSOCIATE.indication message transferred from a MAC layer of the parent node to a higher layer thereof.
  • MAC Media Access Control
  • the sensor network system may include a plurality of child nodes and at least one parent node.
  • the first time information may include plural pieces of time information about elapsed times from time points of last polling requests of the respective child nodes to a wake-up time point of the at least one parent node
  • the second time information may include plural pieces of time information about remaining periods from the wake-up time point of the at least one parent node to time points of directly next predicted polling requests of the respective child nodes.
  • a wake-up time of the parent node may be determined based on shortest remaining period information among the plural pieces of time information included in the second time information.
  • Data transmission from the parent node to the child node may be carried out after the polling request of the child node, and data transmission from the child node to the parent node may be carried out by being embedded in the polling request of the child node.
  • a non-beacon mode ZigBee sensor network system includes: a plurality of child nodes, each providing polling interval information when requesting network participation, and performing network communication via a periodic polling request; and at least one parent node performing the network communication with the child nodes by a wake-up state at a time point of a polling request from each of the child nodes while maintaining a sleep state during a remaining period, for which the polling request from each of the child nodes is not predicted, by determining the time point of the polling request from each of the child nodes based on the polling interval information provided by each of the child nodes.
  • the parent node may frame and update a time table, and determine whether the parent node enters the wake-up state or the sleep state based on the time table, the time table including first time information including plural pieces of time information about elapsed times from time points of last issued polling requests of the respective child nodes to a wake-up time point of the at least one parent node and second time information including plural pieces of time information about remaining periods from the time point of the at least one parent node to time points of directly next predicted polling requests of the respective child nodes.
  • Framing and updating the time table may be carried out in the wake-up state of the parent node.
  • a wake-up time of the parent node may be determined based on shortest remaining period information among the plural pieces of time information included in the second time information.
  • the polling interval information of each of the child nodes may be transferred to the at least one parent node by being embedded in an MLME-ASSOCIATE.request message issued for network participation from a higher layer of a MAC layer of each of the child nodes, and the at least one parent node may obtain the polling interval information of each of the child nodes while processing an MLME-ASSOCIATE.indication message transferred from a MAC layer of the at least one parent node to a higher layer thereof.
  • Data transmission from the at least one parent node to each of the child nodes may be carried out after the polling request from each of the child nodes, and data transmission from each of the child nodes to the at least one parent node may be carried out by being embedded in the polling request of each of the child nodes.
  • the sensor network system can reduce power consumption caused by maintaining a wake-up state of a parent node in network communication. Therefore, the sensor network system according to this embodiment of the invention consumes low power in network communication. Further, the network system can prevent or minimize network instability by guaranteeing symmetrical power consumption between the parent node and a child node.
  • FIGs. 1(a) and 1(b) are diagrams of data transmission procedures in a conventional non-beacon mode network
  • Fig. 2 is a timing chart of a polling request of a child node and a wake-up state of a parent node in the conventional non-beacon mode network;
  • Fig. 3 is a diagram of a non-beacon ZigBee sensor network system and a data transmission procedure according to one embodiment of the present invention
  • Figs. 4 and 5 are diagrams of network participation procedures of the parent node and the child node of Fig. 3;
  • Fig. 6 shows a time table for determining a wake-up time of the parent node of Fig. 3 according to polling intervals of the child nodes;
  • Fig. 7 is a timing chart of a process of waking up the parent node according to the time table of Fig. 6 and the polling requests of child nodes.
  • the term “parent node” refers to a coordinator or a router as well-known to a person having ordinary knowledge in the art
  • the term “child node” refers to a terminal device as well-known to a person having ordinary knowledge in the art, unless they are differently defined in the specification.
  • the terminal device can also be referred to as a sensor node, an end device, a network device or the like.
  • Fig. 3 is a diagram of a non-beacon ZigBee sensor network system and a data transmission procedure according to one embodiment of the present invention.
  • the non-beacon ZigBee sensor network system of this embodiment includes a parent node 100 and a child node 200 that carry out network communication via a predefined protocol.
  • the network system may include at least one parent node 10 and multiple child nodes 200.
  • the network system is directed to reduce power consumption via minimization of asymmetrical power consumption between the parent node and the child node by allowing the parent node 100 to maintain a wake-up state only when the child node 200 issues a polling request.
  • Each of the multiple child nodes 200 provides polling interval information to the parent node 100 when requesting network participation with the parent node 100, and carries out network communication via a periodic polling request when participating in the network.
  • the child node 200 carries out similar operations to those of a conventional child node except for providing the polling interval information to the parent node 100 when requesting the network participation.
  • the child node 200 operates similarly to the conventional child node in that the child node 200 carries out the network communication with the parent node 100 via the periodic polling request.
  • the parent node 100 receives the polling interval information from the child nodes 200 and determines time points of issued polling requests of the child nodes 200.
  • the parent node 100 enables low power consumption of the sensor network system by maintaining a wake-up state at the time points of the polling requests from the child nodes 200 while maintaining a sleep state during a remaining period, for which the polling requests of the child nodes 200 are not predicted.
  • a method of determining the time point of the polling request from each child node 200 will be described below not only in the case where a single childe node 200 is provided to the network system, but also in the case where multiple child nodes 200 are provided thereto.
  • the network communication as described above can provide one problem.
  • a conventional network system when the child node 200 sends data (a data packet) to the parent node 100, the data is sent randomly without time limitation. Such random data transmission of the conventional network system is permitted since a parent node of the network system maintains the wake-up state. According to the embodiment of the invention, however, the parent node 100 alternates between the wake-up state and the sleep state, so that the random data transmission from the child node 200 to the parent node 100 is not permitted.
  • the sensor network system is configured to allow the child node 200 to send data to the parent node 100 by embedding the data in the polling request when issuing the polling request, if there is a need for data transmission from the child node 200.
  • the child node 200 may transmit data to the parent node 100 by embedding the data in a polling request message.
  • the parent node 100 maintains a sleep state in normal times, and enters a wake-up state at the time point of the polling request from the child node 200. As a result, the parent node 100 enters a reception-enabled state RxOn. At this time, a polling request message (Poll) issued from the child node 200 is transferred to the parent node 100.
  • the message and data transmission procedure of between the child node 200 and the parent node 100 is well-known to those skilled in the art.
  • the polling request message may include data to be transmitted from the child node 200 to the parent node 100.
  • the polling request (Poll with Data) having data embedded therein may be transmitted from the child node 200 to the parent node 100.
  • the parent node 100 When receiving the polling request (Poll with Data), the parent node 100 issues and transmits to the child node 200 an acknowledgement message (Ack) which indicates the reception of the polling request (Poll with Data). Then, the parent node 100 transmits data (Pended Data) to the child node 200.
  • Ack acknowledgement message
  • the child node 200 When receiving the data from the parent node 100, the child node 200 issues and transmits to the child node 200 an acknowledgement message (Ack) which indicates the reception of the data.
  • Ack acknowledgement message
  • the parent node 100 After a series of procedures described above, the parent node 100 enters the sleep state and is switched to a reception-disabled state RxOff. The sleep state and the reception-disabled state of the parent node 100 are continued until a next polling request from the child node 200.
  • the parent node 100 alternates between the sleep state and the wake-up state instead of maintaining the wake-up state, it is possible to reduce power consumption compared with the conventional network system.
  • Figs. 4 and 5 are diagrams of procedures for network participation of the child node and the parent node.
  • Fig. 4 shows a summarized procedure for network participation of the child node 200
  • Fig. 5 shows a summarized procedure for network participation of the parent node 100.
  • a network reset or initialization message (or command) MLME-RESET.request is issued from a higher layer of the MAC layer to the MAC layer in the child node 200 for network participation.
  • the term “higher layer” includes the application layer and the network layer, and may be used as a general term referring to any layer above the MAC layer.
  • the MAC layer of the child node 200 issues a confirmation message MLME-RESET.confirm with respect to the network reset or initialization message MLME-RESET.request to the higher layer.
  • the higher layer interchanges scan messages MLME-SCAN.request and MLME-SCAN.confirm with the MAC layer for searching an activated network.
  • the child node reads out all channels of associated frequencies in the three frequency bands defined by the IEEE 802.15.4 standard. In other words, physical channels of a previously defined network are searched.
  • the objective is to connect with an existing network, the same physical channel as that of the existing network is selected, and if the objective is to create an independent network, a physical channel of a deactivated network is selected.
  • Such network policy and channel selection are defined to be determined in the higher layer above the MAC layer for networking flexibility of the IEEE 802.15.4 standard.
  • the IEEE 802.15.4 standard supports 27 physical channels, in which a network of each channel is created with a predetermined energy different from those of other networks of other channels.
  • a child node requesting network participation can perform energy detection (ED) with respect to all channels given by the IEEE 802.15.4 standard according to the network policy.
  • the energy detection (ED) may be used to detect a channel for a deactivated PAN network in order to create a network.
  • the higher layer of the child node 200 issues and transfers a message for network association to the MAC layer, that is, a message MLME-ASSOCIATE.request for address assignment from the parent node 100.
  • the IEEE 802.15.4 standard uses a 64-bit unique address, and a 16-bit address that can be allocated from a parent node.
  • the message MLME-ASSOCIATE.request is a message that has a 64-bit unique address and is directed to receive a 16-bit address from the parent node.
  • the message MLME-ASSOCIATE.request is the message for address request.
  • the 16-bit address employs a short data frame of the physical layer and is known as convenient in development of an addressed-based routing protocol. When the 16-bit address is allocated from the parent node 100 to the child node 200, the child node 200 is connected to the network.
  • the child node 200 may be configured to transmit to the parent node 100 the message MLME-ASSOCIATE.request for address requesting with polling interval information (Poll interval or Poll period, hereinafter, “Poll interval”) inserted into the message.
  • Poll interval or Poll period, hereinafter, “Poll interval”
  • the polling interval information “Poll interval” inserted into the message MLME-ASSOCIATE.request is transferred to the MAC layer (MAC) of the child node 200, and is transferred from the MAC layer (MAC) of the child node 200 to the physical layer (PHY) of the child node 200 via a message PD-DATA.request. Then, the polling interval information is transferred from the physical layer (PHY) of the child node 200 to the physical layer (PHY) of the parent node 100 via a message ASSOCIATION REQUEST.
  • the polling interval information “Poll interval” is transferred from the physical layer (PHY) of the child node 200 to the physical layer (PHY) of the parent node 100 via the message ASSOCIATION REQUEST. Then, the physical layer (PHY) of the parent node 100 transfers the polling interval information to the MAC layer (MAC) of the parent node 100 via a message PD-DATA.indication. Next, the MAC layer (MAC) of the parent node 100 transfers the polling interval information “Poll interval” to a higher layer of the parent node 100 via a message MLME-ASSOCIATE.indication.
  • the higher layer of the parent node 100 allocates an available 16-bit address to the child node 200 according to the policy of the network (NWK) layer.
  • the parent node 100 can be informed of the polling interval of the child node, which requests network participation, while processing the message MLME-ASSOCIATE.indication. Therefore, the parent node 100 frames a time table based on the polling interval information “Poll interval” and determines the time point of the polling request issued from the child node 200. A method of framing the time table and determining the time point of the polling request in the parent node 100 will be described below with reference to Fig. 6.
  • Network integration between the child node 200 and the parent node 100 is completed via the aforementioned procedures.
  • the parent node 100 can know the polling intervals of the respective child nodes 200 through such network integration procedures with the respective child nodes 200.
  • Fig. 6 shows a time table for determining a wake-up time of the parent node 100 according to the polling intervals of the child nodes 200.
  • the wake-up time of the parent node 100 may mean an enabled (activation) time “MAC enable time” of the MAC layer (MAC) of the parent node 100.
  • n is a certain natural number.
  • “In” indicates a polling interval of each child node 200
  • “Pn” indicates information of an elapsed time from a time point of a last issued polling request from an n-th child node to a current wake-up time point of the parent node
  • “In-Pn” indicates information of a remaining period from the current wake-up time point of the parent node to a time point of a next predicted polling request to be issued from the n-th child node.
  • the parent node 100 obtains the plural pieces of polling interval information (I1 ⁇ In) from the multiple child nodes (Child node 1 ⁇ Child node n, hereinafter generally referred to as “200”) during network integration, as described above.
  • the parent node 100 frames a time table based on the plural pieces of polling interval information (I1 ⁇ In).
  • T shortest predicted remaining period
  • the parent node 100 again enters the wake-up state based on the minimum period (shortest period) information among the plural pieces of second time information.
  • the parent node 100 maintains the sleep state for other periods.
  • the child node consists of the first and second child nodes (Child node 1, Child node 2)
  • the first time information (P1) of the first child node (Child node 1) is updated to a time value of “(P1+T)%I1”. It necessarily follows that the first time information (P2) of the second child node (Child node 2) is updated to a time value of “(P2+T)%I2”. Furthermore, the second time information (I1-P1) of the first child node (Child node 1) and the second time information (I2-P2) of the second child node (Child node 2) are also updated.
  • the first time information of the n-th child (Child node n) is updated to a time value of “(Pn+T)%In” and the second time information (In-Pn) thereof is also updated.
  • Framing and updating the time table are carried out by the parent node 100 while the parent node 100 maintains the wake-up state.
  • the parent node 100 calculates the associated time values using a timer, stores the calculated time values in the time table, determines wake-up times according to the reset “T” values, and returns to the sleep state.
  • Fig. 7 is a timing chart of a process of waking up the parent node according to the time table of Fig. 6 and the polling request of the child node. In Fig. 7, it is assumed that the child node consists of two child nodes for convenience of understanding.
  • the first child node (Child node 1) has a polling interval I1 and the second child node (Child node 2) has a polling interval I2.
  • the polling interval I2 of the second child node (Child node 2) is longer than the polling interval I1 of the first child node (Child node 1).
  • a directly previous wake-up time point of the parent node 100 becomes a time point of a thirdly issued polling request of the second child node (Child node 2), and the current wake-up time point of the parent node 100 becomes a time point of a fourthly issued polling request of the first child node (Child node 1).
  • the first time information (P1) of the first child node (Child node 1) has a time value of “0”
  • the first time information (P2) of the second child node (Child node 2) has a time value from the time point of the thirdly issued polling request of the second child node (Child node 2) to the current time point.
  • the second time information I1-P1 of the first child node has a remaining time value from the current time point to a time point of a fifthly issued polling request of the first child node (Child node 1)
  • the second time information I2-P2 of the second child node has a remaining time value from the current time point to a time point of a fourthly issued polling request of the second child node (Child node 2).
  • “T” the shortest remaining period information among the second time information of the first and second child nodes (Child node 1, Child node 2) becomes “I2-P2,” that is, the second time information of the second child node (Child node 2).
  • the non-beacon mode sensor network system can reduce power consumption relating to maintenance of a wake-up state of a parent node. Furthermore, the non-beacon mode sensor network system enables symmetrical power consumption between the parent node and a child node, thereby preventing or minimizing network instability.

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Abstract

L'invention concerne un système de réseaux de capteurs ZigBee en mode de non-radiobalise et un procédé de communication de réseau associé. Le procédé entre un nœud parent et un nœud enfant constituant le système de réseaux de capteurs ZigBee en mode de non-radiobalise comprend la fourniture d'informations d'intervalle de scrutation à un nœud parent s'il existe une demande pour une participation de réseau provenant du nœud enfant, et la réalisation, par le nœud parent, d'une communication de réseau avec le nœud enfant par la détermination d'un instant d'une demande de scrutation provenant du nœud enfant en fonction des informations d'intervalle de scrutation pour maintenir un état de réveil seulement à l'instant de la demande de scrutation provenant du nœud enfant tout en maintenant un état de sommeil pour une période restante. Le système peut réduire la puissance consommée du nœud parent dans une communication de réseau. Le système garantit une puissance consommée symétrique entre le nœud parent et le nœud enfant, ce qui évite l'instabilité de réseau.
PCT/KR2009/003064 2009-06-08 2009-06-08 Système de réseaux de capteurs zigbee en mode de non-radiobalise pour une faible puissance consommée et procédé de communication de réseau associé Ceased WO2010143756A2 (fr)

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PCT/KR2009/003064 WO2010143756A2 (fr) 2009-06-08 2009-06-08 Système de réseaux de capteurs zigbee en mode de non-radiobalise pour une faible puissance consommée et procédé de communication de réseau associé

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US10536901B2 (en) 2015-01-27 2020-01-14 Locix, Inc. Systems and methods for providing communications within wireless sensor networks based on a periodic beacon signal
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