WO2022127588A1 - 一种无线移动通信方法及装置 - Google Patents

一种无线移动通信方法及装置 Download PDF

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WO2022127588A1
WO2022127588A1 PCT/CN2021/134549 CN2021134549W WO2022127588A1 WO 2022127588 A1 WO2022127588 A1 WO 2022127588A1 CN 2021134549 W CN2021134549 W CN 2021134549W WO 2022127588 A1 WO2022127588 A1 WO 2022127588A1
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parent node
node
candidate parent
candidate
mobile
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PCT/CN2021/134549
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French (fr)
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朱兰
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展讯半导体(成都)有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks

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  • the present application relates to the field of communication technologies, and in particular, to a wireless mobile communication method and device.
  • IPv6 wireless sensor networks have been widely used in life scenarios such as health care, industrial monitoring, and smart homes. It has the characteristics of small memory and low cost. For example, sensor equipment worn by patients in medical care, robots in industrial fields, etc., have well applied IPv6 wireless sensor networks.
  • the current IPv6 wireless sensor network is designed for static network, that is, it can only perform better information exchange with nodes in a static state.
  • the mobile node is likely to leave the communication range of the currently connected routing node, which will lead to packet loss and instability in the entire IPv6 wireless sensor network.
  • the present application discloses a wireless mobile communication method and device, which can improve the efficiency and stability of wireless mobile communication.
  • the embodiments of the present application provide a wireless mobile communication method and device, which are applied to a mobile node, and the method includes:
  • the neighbor node that sends the DIO message is taken as the candidate parent node, and the candidate parent node is added to the candidate parent node list;
  • the OF value of the objective function of the candidate parent node is determined according to the DIO message sent by the candidate parent node; the candidate parent node and the OF value of the candidate parent node are added to the list of candidate parent nodes.
  • the OF value of the first parent node is obtained; the OF value of the first parent node is detected. Whether the value is lower than the preset OF value threshold, and if so, it is determined that the conditions for re-establishment of the communication connection are met.
  • the mobile node establishes a communication connection with the second parent node within the time period indicated by the information object DIS message timer of the mobile node.
  • the candidate parent node list includes the second parent node, and if not, it is determined that the conditions for re-establishing the communication connection are satisfied.
  • the mobile node establishes a communication connection with the second parent node within the time period indicated by the information object DIS message timer of the mobile node.
  • the average signal quality ARSSI value of the signal sent by the second parent node received by the mobile node is lower than the preset ARSSI value threshold, Then it is determined that the conditions for the re-establishment of the communication connection are satisfied.
  • the running duration of the DIS message timer is updated to the initial running duration, and after the update is obtained, The DIS message timer; within the time period indicated by the updated DIS message timer, send a DIS message to at least one neighbor node; if the information object DIO message is received, the neighbor node that sends the DIO message is used as a candidate parent node, Add the candidate parent node to the candidate parent node list; after the time period has elapsed from the updated DIS message timer, according to the objective function OF value corresponding to each candidate parent node in the candidate parent node list, in the candidate parent node list A target parent node is determined from at least one candidate parent node included in the node list; a communication connection is established with the target parent node.
  • the candidate parent node with the largest OF value is determined as the target parent node among at least one candidate parent node included in the candidate parent node list.
  • the objective function OF value corresponding to each candidate parent node in the candidate parent node list after determining the target parent node in at least one candidate parent node included in the candidate parent node list, according to the DIO sent by the target parent node.
  • the message determines the first running duration; the running duration of the DIS message timer is updated to the first running duration, and the updated DIS message timer is obtained; within the time period indicated by the updated DIS message timer, to at least one neighbor node Send a DIS message to trigger execution. If an information object DIO message is received, the neighbor node that sent the DIO message is taken as a candidate parent node, and the candidate parent node is added to the candidate parent node list.
  • the mobile node within the time period indicated by the information request DIS message timer of the mobile node, after sending the DIS message to the at least one neighbor node, if the DIO message sent by any neighbor node in the at least one neighbor node is not received, Then, update the running duration of the DIS message timer to the initial running duration, and obtain the updated DIS message timer; within the time period indicated by the updated DIS message timer, send a DIS message to at least one parent node, triggering the execution of if After receiving the notification DIO message, the parent node that sent the DIO message is taken as the candidate parent node, and the candidate parent node is added to the list of candidate parent nodes.
  • the DIS message includes an identity MS used to indicate that the mobile node is in a mobile state
  • the DIO message includes an identity MF used to indicate that the mobile node is in a mobile state
  • an embodiment of the present application provides a wireless mobile communication device, including:
  • a communication unit configured to send a DIS message to at least one neighbor node within the time period indicated by the information request DIS message timer of the mobile node;
  • the processing unit is used to, if receiving the information object DIO message, take the neighbor node sending the DIO message as the candidate parent node, and add the candidate parent node to the candidate parent node list;
  • the above-mentioned processing unit is also used to detect whether the conditions for the re-establishment of the communication connection are met after the time period has elapsed from the DIS message timer timing, and if so, then according to the target function OF value corresponding to each candidate parent node in the candidate parent node list , determine the target parent node in at least one candidate parent node included in the candidate parent node list;
  • the connection unit is used to establish a communication connection with the target parent node.
  • an embodiment of the present application provides a wireless mobile communication device, including a processor, a memory, and a communication interface, where the processor, the memory, and the communication interface are connected to each other, wherein the memory is used to store a computer program, and the computer program includes program instructions , the processor is configured to invoke program instructions to execute the wireless mobile communication method described in the first aspect.
  • an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores one or more instructions, and the one or more instructions are suitable for being loaded and executed by a processor as described in the first aspect Wireless mobile communication method.
  • the mobile node sends a DIS message to at least one neighbor node within the time period indicated by the information request DIS message timer of the mobile node; if it receives the information object DIO message, the neighbor node that sends the DIO message is used as the Candidate parent node, and add the candidate parent node to the candidate parent node list; after the time period elapses from the DIS message timer, check whether the conditions for re-establishing the communication connection are met, if so, according to the candidate parent node list
  • the OF value of the objective function corresponding to each candidate parent node in determines the target parent node in at least one candidate parent node included in the candidate parent node list; establishes a communication connection with the target parent node.
  • FIG. 1 is an architectural diagram of a wireless communication network provided by an embodiment of the present application
  • FIG. 2 is a schematic flowchart of a wireless mobile communication method according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of a frame format of a DIS message provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a frame format of a DIO message provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a mobile node not leaving a current parent node according to an embodiment of the present application
  • FIG. 6 is a schematic diagram of a mobile node leaving the communication range of a previous parent node according to an embodiment of the present application
  • FIG. 7 is a schematic diagram of the positional relationship between a mobile node and a parent node according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a mobile node leaving the current network according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of a mobile node accessing a network for the first time according to an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of triggering mobility detection according to an embodiment of the present application.
  • FIG. 11 is a schematic flowchart of a method for updating a running duration of a DIS message timer according to an embodiment of the present application
  • FIG. 12 is a schematic flowchart of determining a target parent node according to an embodiment of the present application.
  • FIG. 13 is a schematic diagram of a unit of a wireless mobile communication device provided by an embodiment of the present application.
  • FIG. 14 is a simplified schematic diagram of the physical structure of a wireless mobile communication device according to an embodiment of the present application.
  • IPv6 Internet Protocol Version 6
  • IETF Internet Engineering Task Force
  • IP-based low-power wireless local area network IPv6 Routing Protocol for Low-Power and Lossy Networks, RPL: a low-power wireless local area network that combines IEEE802.15.4 and IPv6 protocols.
  • RPL is a distance vector routing protocol that can build goal-oriented directed acyclic graphs (DODAG, or just) in addition to a set of features to constrain traffic flow, support local repair, etc., and provide a flexible way for each node to perform DODAG discovery , construction and maintenance.
  • DODAG goal-oriented directed acyclic graphs
  • DODAG Destination Oriented Directed Acyclic Graph
  • DODAG Information Solicitation It is used to request a DODAG Information Object (DIO) message from the RPL node, and it can also be used to explore neighboring nodes in the neighboring DODAG.
  • DIO DODAG Information Object
  • DODAG Information Object (DODAG Information Object, DIO): Contains the node's own information, such as RANK, MAC address, etc. The neighbor node can only determine whether it can be selected as the parent node after receiving the DIO.
  • OF defines the routing metrics, the optimization of the target path, and the way to calculate the Rank value. At the same time, OF also specifies how to determine the parent node in the DODAG, that is, how to construct the DODAG.
  • the objective function uses a set of metrics and constraints to calculate the optimal path.
  • DAO Destination Advertisement Object
  • Received Signal Strength Indication It is a term of radio frequency signal theory, mainly used for distance measurement between transmitter and receiver. The method determines the distance according to the energy intensity of the received signal, and has high requirements on the parameters of the communication channel. Its ranging theory is: according to the transmission of radio waves or sound waves in the medium, the signal power is attenuated with the propagation distance. According to the transmission power of the known signal of the beacon node and the signal power received by the node, the distance between the nodes can be calculated through the attenuation model between the signal and the distance.
  • EX Expected Transmission Count
  • FIG. 1 shows an architecture diagram of a wireless communication network according to an embodiment of the present application.
  • the wireless communication network architecture diagram includes node 1 to node 9, a mobile node and an IPv6 network.
  • Node 1 to Node 9 may be routing nodes, and are generally fixed nodes.
  • the node 1 is connected to the IPv6 network, so the node 1 can also be called a border node.
  • Routing nodes can send wireless signals to establish connections with mobile nodes.
  • Mobile nodes can be devices with sensors, such as sensor devices worn on patients in healthcare, robots in industrial fields, and so on.
  • each node may distribute its own communication range, and the size of the communication range of each node may be the same or different, depending on the signal transmission power of each node.
  • node 9 points to node 6
  • node 6 points to node 3
  • node 3 points to node 5
  • node 5 points to node 4
  • node 4 points to node 1.
  • node 6 is the parent of node 9
  • node 3 is the parent of node 6.
  • the routing node can be the parent node of the mobile node. The location of the mobile node can be covered by the communication range of multiple routing nodes, and then these nodes can all become neighbor nodes of the mobile node.
  • the network architecture shown in FIG. 1 is a circle of communication range drawn with the mobile node as the center, which is an ideal state, that is, the signal transmission power of each node from node 1 to node 9, Dimensions such as coverage and signal attenuation are all the same. Therefore, the communication range can be drawn with the mobile node as the center. In practical applications, the communication range should be drawn with each routing node as the center of the circle, and considering the complex environment in the actual situation, the communication range is not uniform, so the embodiments of the present application are described in a simplified form without departing from practical applications Scenes.
  • the mobile node has a moving trajectory in the network composed of nodes 1 to 9. As shown by the dotted arrow in the figure, the mobile node enters the network from the far left and exits the network from the far right.
  • the embodiments of the present application provide a method and device for wireless mobile communication, and the method and device for wireless mobile communication provided by the embodiments of the present application are further described below in detail.
  • FIG. 2 provides a schematic flowchart of a wireless mobile communication method according to an embodiment of the present application.
  • the mobile node may be a terminal device including sensors. When the mobile node performs the process shown in Figure 2, the following steps may be included:
  • the information request DIS message timer (running duration is Im ) has been running since the terminal device is started.
  • the running duration of the DIS message timer can be the initial running duration, and the initial running duration (I min ) can be a fixed value, which can be determined according to a relevant protocol, which is not limited here.
  • the mobile node can continuously broadcast at least one DIS message to request the DIO message sent by the neighbor node, which is equivalent to detecting the surrounding neighbor nodes.
  • a routing node, a neighbor node, and a parent node may be the same concept, and a routing node is a node that can be used as a communication connection; when there is a mobile node within the communication range of the routing node, then the routing node is the mobile node The neighbor node of the mobile node; and the parent node is the routing node to which the mobile node is connected.
  • the frame structure of the DIS message may refer to FIG. 3 .
  • the DIS message may include a flag bit (Flag), a Reversed bit, a mobile state (Mobile State, MS) bit, and an option (Option(s)) bit.
  • the MS can be used to indicate whether the mobile node is currently in a mobile state. For example, when the MS is 1, it means that the mobile node is in a mobile state. Of course, when the MS is 0, it can be used to indicate that the mobile node is in a mobile state, which is not limited.
  • the routing node For the routing node, if the DIS message sent by the mobile node can be received, it means that the mobile node is within the communication range of the routing node, so the routing node can send an information object DIO message to the mobile node. In this way, if there are multiple neighbor nodes around the mobile node, multiple DIO messages can be received.
  • the mobile node may determine the OF value of the objective function of the candidate parent node according to the DIO message sent by the neighbor node (candidate parent node). And both the candidate parent node and the OF value of the candidate parent node are added to the candidate parent node list.
  • the OF value is an important indicator that is subsequently used to determine the target parent node.
  • the frame structure of the DIO message may refer to FIG. 4 .
  • the DIO message structure can include the RPL instance ID (Instance ID), which can indicate which RPL instance DODAG belongs to; including the version number (Version Number), random number (Rank), grounded (Grounded, G), mode of operation (Mode of Operation, MOP), DODAG Preference (DODAG Preference), Destination Advertisement Trigger Sequence Number (Destination Advertisement Trigger Sequence Number, DTSN), Flags (Flags), Mobile Flag (Mobile Flag, MF), Reversed bit, DODAG ID (128bit IPv6 address, Set by the DODAG root and uniquely identifies a DODAG. Must be a routable IPv6 address belonging to the DODAG root) and options.
  • the MF is an indicator used to indicate that the mobile node is in a mobile state.
  • the number of DIO messages sent by each neighbor node may be one or more than one, which is not limited in this embodiment of the present application.
  • the OF value of each candidate parent node can be determined in the following manner:
  • the calculation can be performed by using three routing metrics, and the three routing metrics are respectively expected transmission times (ETX), RSSI, and residual energy (RE), and the OF value can be obtained. Calculated as follows:
  • ETX represents the expected number of transmissions required by the current neighbor node to successfully transmit the data packet, and the calculation formula is as follows.
  • ETX max is the ETX value corresponding to the node with the largest ETX value among the neighbor nodes passed by the mobile node.
  • RSSI max is also the RSSI value corresponding to the node with the largest RSSI value among the neighbor nodes passed by the mobile node.
  • RE total is the sum of the remaining energy of each neighbor node passed by the mobile node.
  • the neighbor node passed by the mobile node refers to that the mobile node enters the communication range of the neighbor node.
  • N represents the number of the neighbor node.
  • the N of the node 1 is 1
  • the N of the node 2 is 2.
  • ETX old is the old ETX value of the node
  • the default value of ⁇ is 0.9
  • P s ⁇ d refers to the probability that the data packet successfully reaches the receiver
  • P d ⁇ s refers to the probability that the sending node successfully receives the ACK.
  • the RSSI value is a metric used to measure the signal power of an RF transceiver, which reflects the signal strength of the link between a node and its neighbors. The formula for calculating RSSI is as follows:
  • RSSI RSSI_VALUE+RSSI_OFFSET
  • the residual energy can avoid selecting the node with too low energy as the optimal parent node in the process of selecting the parent node.
  • the calculation formula is as follows:
  • E c V ⁇ (T ap I ap +T lp I lp +T tx I tx +T rx I rx + ⁇ T ni I ni )
  • T ap I ap is the time and current consumed by the node in the active phase
  • T lp I lp is the time and current consumed in the low power phase
  • T tx I tx is the time and current consumed in the transmission phase
  • T rx I rx is The time and current consumed by the receiving node
  • T ni I ni is the time and current consumed by the sensing phase
  • V is the voltage.
  • the target parent node is determined from at least one candidate parent node included in the node list.
  • the first parent node may be node 2, and "M" is the mobile node.
  • the running of the DIS timer ends, the mobile node is currently connected to the first parent node and is still within the communication range of the first parent node. It means that the first parent node is the target parent node determined after the last running of the DIS message timer.
  • the DIS message timer runs this time. After that, the list of candidate parent nodes is updated.
  • the mobile node can detect whether the OF value of the first parent node is lower than the preset OF value threshold, and if so, it means that the first parent node has been unable to communicate with the mobile node normally, and the conditions for re-establishing the communication connection are determined to be satisfied. However, if the OF value of the first parent node is not lower than the preset OF value threshold, it means that the mobile node can still communicate with the first parent node normally, and it is determined that the conditions for re-establishing the communication connection are not met.
  • the mobile node determines that the conditions for re-establishing the communication connection are satisfied, it will re-determine a new parent node for connection. However, if the OF value of the first parent node is not lower than the preset OF value threshold, even if the mobile node detects a neighbor node with a higher OF value, the mobile node will not switch the parent node. This can reduce unnecessary handovers and save network resources.
  • the mobile node within the time period indicated by the DIS message timer, the mobile node establishes a communication connection with the second parent node. Specifically, the mobile node is connected to the second node during the running period of the DIS message timer, and disconnected from the second parent node before the running of the DIS message timer ends. As shown in FIG. 6 , the second parent node may be node 2 . If the mobile node detects that the time period indicated by the DIS message timer has elapsed, it determines whether the second parent node is included in the candidate parent node list generated after the DIS message timer ends. If not, it is determined that the conditions for re-establishment of the communication connection are satisfied.
  • the average signal quality (Average RSSI) of the received signal sent by the second parent node is detected.
  • ARSSI Average signal quality
  • the preset ARSSI value threshold it can be determined that the communication connection between the mobile node and the second parent node has been disconnected, and the condition for re-establishing the communication connection is satisfied.
  • the ARSSI of the signal sent by the second parent node received by the mobile node is lower than the preset ARSSI value threshold, and this situation is called triggering "mobility detection".
  • the mobile node when the mobile node triggers the mobility detection, it can be determined that the conditions for re-establishment of the communication connection are satisfied.
  • the weighted average RSSI value is used for mobility detection, information is exchanged between the mobile node and the parent node, and the ARSSI value is periodically calculated through the exchanged information. If the ARSSI value exceeds the threshold, it means that the link is stable, and the mobile node and the parent node can continue to transmit data; if the ARSSI value is lower than the threshold, it means that the link between the nodes is unstable. loss of packets.
  • the period of the ARSSI value may be set to 5, that is, every 5 RSSIs are received, the ARSSI values of the 5 RSSIs are calculated.
  • the threshold range of ARSSI value is taken as [-92dBm,-80dBm], that is to say, the threshold can be determined according to the specific situation.
  • the formula for calculating the ARSSI value can be:
  • the mobile node can determine that the conditions for re-establishment of the communication connection are satisfied. Then the mobile node will determine the target parent node from the list of candidate parent nodes after the running of the DIS message timer to establish a new communication connection. Specifically, according to the OF values corresponding to each candidate parent node in the candidate parent node list, the mobile node determines, among at least one candidate parent node included in the candidate parent node list, the parent node with the largest OF value as the target parent node.
  • the mobile node may send a connect DAO message to the target parent node, and send a disconnect DAO message to the previous parent node. If the mobile node has left the communication range of the last parent node, it can send the disconnect DAO message of the last parent node to the target parent node, and the target parent node forwards the disconnect DAO message to the last parent node.
  • establishing a communication connection between the mobile node and the target parent node is actually a process of link switching.
  • link handover can use the method of soft handover.
  • Soft handover will use two DAO messages to switch links, namely connect DAO message and disconnect DAO message.
  • the connection DAO message is used to connect the new optimal parent node, that is, the target parent node; the disconnected DAO message is used to delete the path between the previous parent nodes and disconnect the previous link.
  • the mobile node selects its own optimal parent node, it will send two timely DAO messages to the old parent node (previous parent node) and the new parent node (target parent node). Then, disconnecting the DAO message will delete the old down path, and connecting the DAO message will create a new link.
  • soft handover is a default manner, and the mobile node can also perform link handover in a hard handover manner.
  • Hard handoff is only used under certain conditions, for example, within a period of time (for example: 150 milliseconds), the mobile node does not receive any information from the parent node; or, before disconnecting the previous link, there is no information for a period of time Any information received from surrounding neighbor nodes; or when the network is busy.
  • the first running duration may be determined according to the DIO information sent by the target parent node.
  • the DIS message timer will restart timing after each running, and the length of each timing needs to be calculated.
  • the first running duration is the duration of the next running of the DIS message timer.
  • the mobile node updates the running duration of the DIS message timer to the first running duration to obtain the updated DIS message timer.
  • the mobile node can send a DIS message to at least one neighbor node within the time period indicated by the updated DIS message timer, and trigger execution.
  • the neighbor node that sent the DIO message is used as a candidate parent node, and Add the candidate parent node to the candidate parent node list. In this way, neighbor nodes can be detected cyclically, and the list of candidate parent nodes can be updated cyclically.
  • the method for determining the next running duration of the DIS message timer may be as follows:
  • the moving speed of the mobile node be V m
  • the angle between the mobile node and the parent node is ⁇
  • the electromagnetic wave speed is c
  • the Doppler frequency is f d
  • the receiving frequency is fr
  • the Doppler frequency can be calculated as follows The formula gets:
  • FIG. 7 shows a schematic diagram of the mobile node leaving the communication range of the current parent node (node 5). 7 is the communication range of the node 5 drawn as the center of the circle; ⁇ is the angle between the mobile node and its current parent node, and d f is the distance between the mobile node and its current parent node.
  • the moving direction of the mobile node can be measured by methods such as sideband filtering, offset carrier demodulation, and co-direction/quadrature demodulation.
  • the distance is then estimated by using the RSSI value to vary with distance. Since router nodes transmit fixed-strength signals, distance can be estimated from the strength of attenuated signals received by mobile nodes.
  • the transmission loss (Loss, L) (in dBm) in the transmitted signal is calculated as the difference between the two signals (this difference can be determined from the DIO message sent by this parent node), according to Frisian free space propagation
  • the model can get:
  • ⁇ is the wavelength of the electromagnetic wave.
  • d f can be calculated, and then de can be calculated according to the second law of the cosine law.
  • the calculation formula is as follows:
  • the setting of the DIS message timer time takes into account the randomness of the speed and direction of the mobile node in the moving process. In order to set the timer time more accurately, the time interval is set to be within [t/2,t] choose.
  • the calculation formula of the timer setting time Im is as follows:
  • the Im of the DIS message timer that is, the first running duration, can be determined.
  • the mobile node after the mobile node sends a DIS message to at least one neighbor node within the time period indicated by the DIS message timer, if it does not receive a DIO message sent by any neighbor node in the at least one neighbor node, Then it is determined that the mobile node has left the current network. As shown in Figure 8, if there is no neighbor node within the current communication range of the mobile node, it is considered that it has left the network.
  • the mobile node can update the running duration of the DIS message timer to the initial running duration to obtain the updated DIS message timer.
  • the mobile node can send a DIS message to at least one neighbor node within the time period indicated by the updated DIS message timer, and trigger execution.
  • the neighbor node that sent the DIO message is used as a candidate parent node, and Add the candidate parent node to the candidate parent node list. In this way, neighbor nodes can be detected cyclically, and the list of candidate parent nodes can be updated cyclically.
  • the mobile node accesses the network for the first time, for example, the mobile node is powered on for the first time, or the mobile node is not connected to any parent node during the last running of the DIS message timer.
  • the state enters the current network. If the mobile node detects that the mobile node is not connected to any parent node within the time period indicated by the DIS message timer, it updates the running duration of the DIS message timer to the initial running duration, and obtains the updated DIS message timer . That is, if the mobile node cannot always detect the neighbor node to determine the target parent node, the mobile node will keep the running duration of the DIS message timer as the initial running duration.
  • the mobile node may send a DIS message to at least one neighbor node within the time period indicated by the updated DIS message timer. If the DIO information is received, the neighbor node sending the DIO message is taken as a candidate parent node, and the candidate parent node is added to the candidate parent node list. When the time period indicated by the updated DIS message timer starts to elapse, the mobile node can, according to the OF values corresponding to each candidate parent node in the candidate parent node list, select at least one candidate parent node included in the candidate parent node list The target parent node is determined in the middle, and a communication connection is established with the target parent node.
  • the mobile node can send a DIS message to at least one neighbor node within the time period indicated by the DIS message timer, and if a DIO message is received, it can determine that a neighbor node exists in the current network.
  • the mobile node can take the neighbor node that sends the DIO message as the candidate parent node, calculate the OF value of the candidate parent node, and add both to the candidate parent node list.
  • the DIS message timer ends, it can be detected whether a new parent node (target parent node) needs to be selected to establish a connection, and if so, the target parent node can be determined according to the OF value of each candidate parent node in the candidate parent node list, and establish a communication connection with it.
  • the mobile node can continuously search for neighbor nodes in the network, and can quickly determine the target parent node to establish a communication connection when it needs to switch to a new parent node, which can improve the efficiency and stability of wireless mobile communication.
  • FIG. 10 is a schematic flowchart of triggering mobility detection according to an embodiment of the present application.
  • the mobile node performs the process of FIG. 10, the following steps may be included:
  • the ARSSI value is higher than the ARSSI value threshold, it means that the link is stable, and the mobile node and the parent node can continue to transmit data.
  • the ARSSI value is lower than the threshold, it means that the link between nodes is unstable, and if data transmission continues at this time, data packets will be lost.
  • the mobile node can trigger mobility detection when the ARSSI value is lower than the ARSSI value threshold, so as to determine the target parent node according to the list of candidate parent nodes, the target parent node is the new parent node, and the new parent node A connection is established to ensure that the mobile node accesses the network in time.
  • FIG. 11 is a schematic flowchart of a method for updating a running duration of a DIS message timer according to an embodiment of the present application.
  • the mobile node performs the process of FIG. 11, the following steps may be included:
  • the time interval is the ratio of the distance d e that the mobile node leaves the communication range of the target parent node to the moving speed V m of the mobile node.
  • the running duration of the DIS message timer can be consistent with the running duration of the last running. This can be described as updating the running duration of the DIS message timer to the running duration of the last DIS message timer.
  • the DIS message timer can be updated in time, and the mobile node can continuously broadcast the DIS message within the DIS message timer to request the DIO message.
  • the list of candidate parent nodes can be updated in real time, so that the mobile node can connect to the new parent node in time when needed, thereby improving the efficiency and stability of wireless mobile communication.
  • Fig. 12 is a schematic flowchart of determining a target parent node provided by the implementation of this application. When the mobile node performs the process of FIG. 11, the following steps may be included:
  • the DIS message timer is determined to be the initial running duration.
  • the mobile node If the DIS message timer has not expired and the mobile node has not triggered mobility detection, the mobile node is connected to a parent node, and continues to transmit data through the parent node.
  • DIS message timer expires or the mobile node triggers mobility detection, determine whether it is necessary to determine whether a new parent node needs to establish a communication connection.
  • step 1250 If it is executed from step 1250, it means that it is not necessary to determine a new parent node to establish a communication connection.
  • the DIS message timer is updated here, and the running duration of the DIS message timer does not change. If the mobile node does not receive any DIO message after the DIS message timer expires, it is determined that the mobile node leaves the network, and the running duration of the DIS message timer is updated to the initial running duration.
  • step 1260 If it is executed from step 1260, it means that the mobile node has been connected to the target parent node, and the running duration of the next DIS message timer can be determined according to the DIO message of the target parent node, and the DIS message timer can be updated.
  • the mobile node can send a DIS message to at least one neighbor node within the time period indicated by the DIS message timer, and if a DIO message is received, it can be determined that a neighbor node exists in the current network.
  • the mobile node can take the neighbor node that sends the DIO message as the candidate parent node, calculate the OF value of the candidate parent node, and add both to the candidate parent node list.
  • the DIS message timer ends, it can be detected whether a new parent node (target parent node) needs to be selected to establish a connection, and if so, the target parent node can be determined according to the OF value of each candidate parent node in the candidate parent node list, and establish a communication connection with it.
  • the mobile node can continuously search for neighbor nodes in the network, and can quickly determine the target parent node to establish a communication connection when it needs to switch to a new parent node, which can improve the efficiency and stability of wireless mobile communication.
  • FIG. 13 is a schematic diagram of a unit of a wireless mobile communication device provided by an embodiment of the present application.
  • the wireless mobile communication device shown in FIG. 13 can be used to perform some or all of the functions in the method embodiments described in the above-mentioned FIG. 2 , FIG. 10 , FIG. 11 and FIG. 12 .
  • the device may be a mobile node, or a device in the mobile node, or a device that can be matched and used with the mobile node.
  • the logical structure of the apparatus may include: a communication unit 1310 , a processing unit 1320 and a connection unit 1330 .
  • a communication unit 1310 When the device is applied to a mobile node:
  • the communication unit 1310 is configured to send a DIS message to at least one neighbor node within the time period indicated by the information request DIS message timer of the mobile node;
  • the processing unit 1320 is configured to, if receiving the information object DIO message, take the neighbor node sending the DIO message as the candidate parent node, and add the candidate parent node to the candidate parent node list;
  • the above-mentioned processing unit 1320 is also used to detect whether the condition for the re-establishment of the communication connection is satisfied after the time period from the DIS message timer is counted, and if satisfied, then according to the target function OF corresponding to each candidate parent node in the candidate parent node list. value, the target parent node is determined in at least one candidate parent node included in the candidate parent node list;
  • the connection unit 1330 is configured to establish a communication connection with the target parent node.
  • the above-mentioned processing unit 1320 is further configured to determine the objective function OF value of the candidate parent node according to the DIO message sent by the candidate parent node; add the candidate parent node and the OF value of the candidate parent node to the candidate parent node List.
  • the above-mentioned processing unit 1320 is further configured to obtain the information of the first parent node if it is detected that the mobile node is currently connected to the first parent node after the time period has elapsed from the time of the DIS message timer. OF value; detecting whether the OF value of the first parent node is lower than the preset OF value threshold, and if so, it is determined that the conditions for re-establishing the communication connection are met.
  • the mobile node establishes a communication connection with the second parent node within the time period indicated by the information object DIS message timer of the mobile node.
  • the above-mentioned processing unit 1320 is further configured to detect whether the candidate parent node list includes the second parent node, and if not, determine that the communication is satisfied Conditions for connection re-establishment.
  • the mobile node establishes a communication connection with the second parent node within the time period indicated by the information object DIS message timer of the mobile node.
  • the above-mentioned processing unit 1320 is further configured to detect the average signal quality of the signal sent by the second parent node received by the mobile node If the ARSSI value is lower than the preset ARSSI value threshold, it is determined that the condition for re-establishing the communication connection is satisfied.
  • the above-mentioned processing unit 1320 is further configured to, if it is detected that within the time period indicated by the DIS message timer of the mobile node, the mobile node is not connected to any parent node, turn the running of the DIS message timer The duration is updated to the initial running duration, and the updated DIS message timer is obtained; within the time period indicated by the updated DIS message timer, a DIS message is sent to at least one neighbor node; if an information object DIO message is received, it will be sent The neighbor node of the DIO message is used as the candidate parent node, and the candidate parent node is added to the candidate parent node list; after the time period has elapsed from the updated DIS message timer, according to each candidate parent node in the candidate parent node list The corresponding OF value of the objective function determines the target parent node in at least one candidate parent node included in the candidate parent node list; the above-mentioned connecting unit 1330 is further configured to establish a communication connection with
  • the above-mentioned processing unit 1320 is further configured to, according to the OF values corresponding to each candidate parent node in the candidate parent node list, determine the one with the largest OF value among at least one candidate parent node included in the candidate parent node list.
  • the candidate parent node is the target parent node.
  • the above-mentioned processing unit 1320 It is also used to determine the first running duration according to the DIO message sent by the target parent node; the running duration of the DIS message timer is updated to the first running duration, and the updated DIS message timer is obtained; the updated DIS message timer indicates During the period of time, the above-mentioned communication unit 1310 is also used to send a DIS message to at least one neighbor node, and triggers the processing unit 1320 to execute, if an information object DIO message is received, the neighbor node that sends the DIO message is used as a candidate parent node, and the candidate The parent node is added to the list of candidate parent nodes.
  • the processing unit 1320 is further configured to, if the at least one neighbor node is not received In the DIO message sent by any neighbor node, the running duration of the DIS message timer is updated to the initial running duration, and the updated DIS message timer is obtained; In the time period indicated by the updated DIS message timer, the above communication
  • the unit 1310 is further configured to send a DIS message to at least one parent node, and trigger the processing unit 1320 to execute, if a notification DIO message is received, take the parent node that sent the DIO message as a candidate parent node, and add the candidate parent node to the list of candidate parent nodes. middle.
  • the DIS message includes an identifier MS that is used to indicate that the mobile node is in a mobile state
  • the DIO message includes an identifier MF that is used to indicate that the mobile node is in a moving state.
  • FIG. 14 is a simplified schematic diagram of the physical structure of a wireless mobile communication device according to an embodiment of the application.
  • the device includes a processor 1410, a memory 1420, and a communication interface 1430.
  • the processor 1410, the memory 1420, and the communication interface The 1430 is connected by one or more communication buses.
  • the processor 1410 is configured to support the wireless mobile communication device to perform functions corresponding to the methods in FIGS. 2 , 10 , 11 and 12 .
  • the processor 1410 may be a central processing unit (central processing unit, CPU for short), and the processor may also be other general-purpose processors, digital signal processors (digital signal processor, DSP for short) ), application specific integrated circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the memory 1420 is used to store program codes and the like.
  • the memory 1420 in this embodiment of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memory.
  • the non-volatile memory may be read-only memory (ROM for short), programmable read-only memory (PROM for short), erasable programmable read-only memory (EPROM for short) , Electrically Erasable Programmable Read-Only Memory (electrically EPROM, EEPROM for short) or flash memory.
  • Volatile memory may be random access memory (RAM), which acts as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous Dynamic random access memory
  • SDRAM synchronous Dynamic random access memory
  • DDR SDRAM double data rate synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM Synchronous connection dynamic random access memory
  • DR RAM direct memory bus random access memory
  • the communication interface 1430 is used to send and receive data, information or messages, etc., and can also be described as a transceiver, a transceiver circuit, and the like.
  • the processor 1410 invokes program codes stored in the memory 1420 to perform the following operations:
  • processor 1410 calls the program code stored in the memory 1420 and receives the information object DIO message, then the neighbor node sending the DIO message is used as the candidate parent node, and the candidate parent node is added to the candidate parent node list;
  • the processor 1410 calls the program code stored in the memory 1420 to detect whether the conditions for the re-establishment of the communication connection are met after the time period has elapsed from the time of the DIS message timer.
  • the OF value of the objective function, the target parent node is determined in at least one candidate parent node included in the candidate parent node list;
  • the control communication interface 1430 establishes a communication connection with the target parent node.
  • the processor 1410 invokes the program code stored in the memory 1420 to determine the OF value of the objective function of the candidate parent node according to the DIO message sent by the candidate parent node; adding the OF value of the candidate parent node and the candidate parent node to the list of candidate parent nodes.
  • the processor 1410 calls the program code stored in the memory 1420 after the time period elapses from the DIS message timer, if it detects that the mobile node is currently connected to the first parent node, obtains the first An OF value of a parent node; detecting whether the OF value of the first parent node is lower than a preset OF value threshold, and if so, it is determined that the conditions for re-establishing the communication connection are met.
  • the mobile node establishes a communication connection with the second parent node within the time period indicated by the information object DIS message timer of the mobile node.
  • the processor 1410 calls the program code stored in the memory 1420 to detect whether the list of candidate parent nodes includes the second parent node, and if not, Then it is determined that the conditions for the re-establishment of the communication connection are satisfied.
  • the mobile node establishes a communication connection with the second parent node within the time period indicated by the information object DIS message timer of the mobile node.
  • the processor 1410 invokes the program code stored in the memory 1420 to detect that the mobile node receives a signal sent by the second parent node If the average signal quality ARSSI value is lower than the preset ARSSI value threshold, it is determined that the conditions for re-establishing the communication connection are satisfied.
  • the processor 1410 calls the program code stored in the memory 1420 if it is detected that the mobile node is not connected to any parent node within the time period indicated by the DIS message timer of the mobile node, and sends the DIS message to the mobile node.
  • the running duration of the timer is updated to the initial running duration, and an updated DIS message timer is obtained; within the time period indicated by the updated DIS message timer, a DIS message is sent to at least one neighbor node; if an information object DIO message is received , the neighbor node sending the DIO message is taken as the candidate parent node, and the candidate parent node is added to the candidate parent node list;
  • the target function OF value corresponding to each candidate parent node determines the target parent node in at least one candidate parent node included in the candidate parent node list; the communication interface 1430 is controlled to establish a communication connection with the target parent node.
  • the processor 1410 calls the program code stored in the memory 1420 to determine from at least one candidate parent node included in the candidate parent node list according to the OF values corresponding to each candidate parent node in the candidate parent node list The candidate parent node with the largest OF value is the target parent node.
  • the processor 1410 calls The program code stored in the memory 1420 determines the first running duration according to the DIO message sent by the target parent node; the running duration of the DIS message timer is updated to the first running duration, and the updated DIS message timer is obtained; During the time period indicated by the message timer, the control communication interface 1430 sends a DIS message to at least one neighbor node, and triggers the processor 1410 to call the program code stored in the memory 1420 to execute the DIO message. node as a candidate parent node, and add the candidate parent node to the candidate parent node list.
  • the processor 1410 invokes the program code stored in the memory 1420 if the DIS message is not received For a DIO message sent by any neighbor node in at least one neighbor node, update the running duration of the DIS message timer to the initial running duration, and obtain the updated DIS message timer; in the time period indicated by the updated DIS message timer Inside, the control communication interface 1430 sends a DIS message to at least one parent node, and triggers the processor 1410 to call the program code stored in the memory 1420 to execute the notification DIO message.
  • the candidate parent node is added to the list of candidate parent nodes.
  • the DIS message includes an identifier MS that is used to indicate that the mobile node is in a mobile state
  • the DIO message includes an identifier MF that is used to indicate that the mobile node is in a moving state.
  • the units in the processing device in the embodiment of the present invention may be combined, divided, and deleted according to actual needs.
  • a computer program product includes one or more computer instructions.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • Computer instructions may be stored on or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server, or data center over a wire (e.g.
  • a computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, or the like that contains one or more of the available mediums integrated.
  • Useful media may be magnetic media (eg, floppy disks, storage disks, magnetic tapes), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), among others.
  • Each device and product described in the above embodiments includes modules/units, which may be software modules/units or hardware modules/units, or may be partly software modules/units and partly hardware modules/units.
  • each module/unit included in the product may be implemented by hardware such as circuits, or at least some modules/units may be implemented by software programs, which run on the integrated processing inside the chip.
  • the remaining part of the modules/units can be implemented by hardware such as circuits; for each device and product corresponding to or integrated with chip modules, each module/unit included can be implemented by hardware such as circuits.
  • the unit may be located in the same piece of the chip module (such as a chip, a circuit module, etc.) or in different components, and at least part/unit may be implemented by a software program that runs on the remaining part of the integrated processor module inside the chip module/
  • the unit can be implemented by hardware such as circuits; for each device or product that corresponds to or integrates the terminal, the modules/units included in it can be implemented by hardware such as circuits, and different modules/units can be located in the same component in the terminal (for example, Chips, circuit modules, etc.) or different components, or at least some of the modules/units can be implemented in the form of software programs, which run on the processor integrated inside the terminal, and the remaining sub-modules/units can be implemented in hardware such as circuits.

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Abstract

本申请公开了一种无线移动通信方法及装置，其中，该方法包括：在移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中；在从DIS消息定时器计时开始经过该时间段后，检测是否满足通信连接重新建立的条件，若满足，则根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点；与目标父节点建立通信连接。通过该方法，可以提高无线移动通信的效率和稳定性。

Description

一种无线移动通信方法及装置 技术领域
本申请涉及通信技术领域，尤其涉及一种无线移动通信方法及装置。
背景技术
互联网协议第6版(Internet Protocol Version 6，IPv6)无线传感器网络已被广泛应用于医疗保健、工业监视、智能家居等生活场景中，这是得益于IPv6无线传感器节点的带宽低、范围小、内存量小、成本低等特点。例如，在医疗保健中患者身上穿戴的传感器设备、工业领域中的机器人等都较好地应用了IPv6无线传感器网络。
目前的IPv6无线传感器网络是为静态网络设计的，即只能与处于静止状态的节点进行较好地信息交互。而当网络中存在移动节点时，移动节点很可能会离开当前连接的路由节点的通信范围，这样就会导致整个IPv6无线传感器网络出现丢包、不稳定等现象。
发明内容
本申请公开了一种无线移动通信方法及装置，可以提高无线移动通信的效率和稳定性。
第一方面，本申请实施例提供了一种无线移动通信方法及装置，应用于移动节点，该方法包括：
在移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；
若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中；
在从DIS消息定时器计时开始经过该时间段后，检测是否满足通信连接重新建立的条件，若满足，则根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点；
与目标父节点建立通信连接。
在一实施方式中，根据候选父节点发送的DIO消息确定候选父节点的目标函数OF值；将候选父节点和候选父节点的OF值添加到候选父节点列表中。
在一实施方式中，在从DIS消息定时器计时开始经过该时间段后，若检测到移动节点当前连接于第一父节点，则获取第一父节点的OF值；检测第一父节点的OF值是否低于预设OF值阈值，若是，则确定满足通信连接重新建立的条件。
在一实施方式中，移动节点在移动节点的信息对象DIS消息定时器指示的时间段内与第二父节点建立了通信连接。
在一实施方式中，在从DIS消息定时器计时开始经过该时间段后，检测候选父节点列表中是否包括第二父节点，若否，则确定满足通信连接重新建立的条件。
在一实施方式中，移动节点在移动节点的信息对象DIS消息定时器指示的时间段内与第二父节点建立了通信连接。
在一实施方式中，若在移动节点的信息请求DIS消息定时器指示的时间段内，检测到移动节点接收到的第二父节点发送信号的平均信号质量ARSSI值低于预设ARSSI值阈值，则确定满足通信连接重新建立的条件。
在一实施方式中，若检测到在移动节点的DIS消息定时器指示的时间段内，移动节点未连接任一父节点，则将DIS消息定时器的运行时长更新为初始运行时长，得到更新后的DIS消息定时器；在更新后的DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中；在从更新后的DIS消息定时器计时开始经过该时间段后，根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点；与目标父节点建立通信连接。
在一实施方式中，根据候选父节点列表中各个候选父节点对应的OF值，在候选父节点列表所包含的至少一个候选父节点中确定OF值最大的候选父节点为目标父节点。
在一实施方式中，根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点之 后，根据目标父节点发送的DIO消息确定第一运行时长；将DIS消息定时器的运行时长更新为第一运行时长，得到更新后的DIS消息定时器；在更新后的DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息，触发执行若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中。
在一实施方式中，在移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息之后，若未接收到至少一个邻居节点中任一邻居节点发送的DIO消息，则将DIS消息定时器的运行时长更新为初始运行时长，得到更新后的DIS消息定时器；在更新后的DIS消息定时器指示的时间段内，向至少一个父节点发送DIS消息，触发执行若接收到通告DIO消息，则将发送DIO消息的父节点作为候选父节点，并将候选父节点添加到候选父节点列表中。
在一实施方式中，DIS消息包括用于指示移动节点处于移动状态的标识MS，DIO消息包括用于指示移动节点处于移动状态的标识MF。
第二方面，本申请实施例提供了一种无线移动通信装置，包括：
通信单元，用于在移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；
处理单元，用于若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中；
上述处理单元还用于在从DIS消息定时器计时开始经过该时间段后，检测是否满足通信连接重新建立的条件，若满足，则根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点；
连接单元，用于与目标父节点建立通信连接。
第三方面，本申请实施例提供了一种无线移动通信装置，包括处理器、存储器和通信接口，处理器、存储器和通信接口相互连接，其中，存储器用于存储计算机程序，计算机程序包括程序指令，处理器被配置用于调用程序指令，执行如第一方面描述的无线移动通信方法。
第四方面，本申请实施例提供了一种计算机可读存储介质，计算机可读存 储介质存储有一条或多条指令，一条或多条指令适于由处理器加载并执行如第一方面描述的无线移动通信方法。
本申请实施例中，移动节点在移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中；在从DIS消息定时器计时开始经过该时间段后，检测是否满足通信连接重新建立的条件，若满足，则根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点；与目标父节点建立通信连接。通过该方法，可以提高无线移动通信的效率和稳定性。
附图说明
为了更清楚地说明本申请实施例技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的一种无线通信网络架构图；
图2为本申请实施例提供的一种无线移动通信方法的流程示意图；
图3为本申请实施例提供的DIS消息的帧格式示意图；
图4为本申请实施例提供的DIO消息的帧格式示意图；
图5为本申请实施例提供的移动节点未离开当前父节点的示意图；
图6为本申请实施例提供的一种移动节点离开上一个父节点通信范围的示意图；
图7为本申请实施例提供的一种移动节点与父节点位置关系示意图；
图8为本申请实施例提供的一种移动节点离开当前网络的示意图；
图9为本申请实施例提供的一种移动节点首次入网的示意图；
图10为本申请实施例提供的一种触发移动性检测的流程示意图；
图11为本申请实施例提供的一种DIS消息定时器更新运行时长方法的流程示意图；
图12为本申请实施例提供的一种确定目标父节点的流程示意图；
图13为本申请实施例提供的一种无线移动通信装置的单元示意图；
图14为本申请实施例提供的一种无线移动通信装置的实体结构简化示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。
为了能够更好地理解本申请实施例，下面对本申请实施例涉及的专业术语进行介绍：
互联网协议第6版(Internet Protocol Version 6，IPv6)：是互联网工程任务组(IETF)设计的用于替代IPv4的下一代IP协议，其地址数量号称可以为全世界的每一粒沙子编上一个地址。由于IPv4最大的问题在于网络地址资源不足，严重制约了互联网的应用和发展。IPv6的使用，不仅能解决网络地址资源数量的问题，而且也解决了多种接入设备连入互联网的障碍。
基于IP技术的低功耗无线局域网(IPv6Routing Protocol for Low-Power and Lossy Networks，RPL)：一种低功耗无线局域网，结合了IEEE802.15.4和IPv6协议。RPL是距离向量路由协议，可以构建面向目标的有向无环图DODAG,或者只是)除了一组特性约束控制流量,支持本地修复,等,并提供了一个灵活的方法,每个节点执行DODAG发现,建设和维护。
以目的节点为导向的有向无环图(Destination Oriented Directed Acyclic Graph，DODAG)：是一种树形的路由结构。
DODAG信息请求(DODAG Information Solicitation，DIS)：用来请求一个来自RPL节点的DODAG信息对象(DODAG Information Object，DIO)消息，还可以用于探索临近DODAG中的邻居节点。
DODAG信息对象(DODAG Information Object，DIO)：包含节点自身信息，比如RANK、MAC地址等，邻居节点只有收到了DIO以后才确定是否能选择它为父节点。
目标函数(Objective Function，OF)：OF定义了路由计量标准、目标路径 优化，以及计算Rank值的方式。与此同时，OF还规定了如何确定DODAG中的父节点的方式，即如何构造DODAG。目标函数利用度量和约束条件的集合计算出最优路径。
目的地通告(Destination Advertisement Object，DAO)：这个包是为了数据下传用的，子节点传给父节点报告其距离等消息。
接收的信号强度指示(Received Signal Strength Indication，RSSI)：是射频信号理论术语，主要应用于发射机和接收机之间的距离测量。该方法是依据接收信号能量强度确定距离，对通信信道参数要求较高。其测距理论是：依据无线电波或声波在介质中传输，信号功率是随传播距离衰减的原理。根据信标节点已知信号的发射功率和节点接收的信号功率，通过信号与距离之间的衰减模型，就可以计算出节点间的距离。
期望传输数(Expected Transmission Count，ETX)：成功传输每个数据包，期望的平均传输次数。
为了能够更好地理解本申请实施例，下面对本申请实施例可应用的网络架构进行说明。
如图1所示为本申请实施例提供的一种无线通信网络架构图。该无线通信网络架构图中包括节点1～节点9、移动节点和IPv6网络。节点1～节点9可以是路由节点，一般是固定的节点。其中，节点1与IPv6网络连接，所以节点1也可以称为边界节点。路由节点可以发送无线信号，与移动节点建立连接。移动节点可以是带有传感器的设备，如医疗保健中患者身上穿戴的传感器设备、工业领域中的机器人等。节点1～节点9中，每个节点都可以分别分布各自的通信范围，每个节点的通信范围的大小可以相同，也可以不相同，具体取决于每个节点的信号发射功率。图1中，节点9指向节点6，节点6指向节点3，节点3指向节点5，节点5指向节点4，最后节点4再指向节点1。这是表示节点6是节点9的父节点，节点3是节点6的父节点。本申请实施例中，路由节点之间存在父节点的概念，而当移动节点与某路由节点建立连接，那么就可以成该路由节点为该移动节点的父节点。而移动节点所处位置可以被多个路由节点的通信范围所覆盖，那么这些节点都可以成为该移动节点的邻居节点。
需要说明的是，为方便说明，图1所示的网络架构是以移动节点为圆心绘制的通信范围圆圈，这是一种理想状态，即节点1～节点9的每个节点的信号发射功率、覆盖范围、信号衰减度等维度都相同。故可以以移动节点为圆心绘制通信范围。在实际应用中，应以每个路由节点为圆心绘制通信范围，并且考虑到实际情况中的复杂环境，通信范围也并非均匀，所以本申请实施例以简化的形式进行描述，并不脱离实际应用场景。移动节点在节点1～节点9组成的网络中有一个移动轨迹，图中的虚线箭头所示，移动节点从最左边进入该网络，从最右边退出该网络。
为了能够提高无线移动通信的效率，本申请实施例提供了一种无线移动通信方法及装置，下面进一步对本申请实施例提供的无线移动通信方法及装置进行详细介绍。
请参见图2，图2为本申请实施例提供了一种无线移动通信方法的流程示意图。该移动节点可以是包括传感器的终端设备。当移动节点执行图2所示的流程时，可以包括以下步骤：
210、在移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息。
其中，该信息请求DIS消息定时器(运行时长为I m)从终端设备启动后就一直开始运行。当移动节点启动后，该DIS消息定时器的运行时长可以是初始运行时长，该初始运行时长(I min)可以是一个固定的数值，该数值可以根据相关的协议进行确定，此处不作限定。在DIS消息定时器运行期间，即DIS消息定时器指示的时间段内，移动节点可以不停地广播至少一个DIS消息以请求邻居节点发送的DIO消息，相当于探测周围的邻居节点。本申请实施例中，路由节点、邻居节点和父节点可以是相同的概念，路由节点是可以作为通信连接的节点；当该路由节点的通信范围内有移动节点，那么该路由节点就是该移动节点的邻居节点；而父节点是移动节点所连接的路由节点。
其中，DIS消息的帧结构可以参见图3。DIS消息可以包括标志位(Flag)、Reversed位、移动状态(Mobile State，MS)位和选项(Option(s))位。其中，MS可以用于指示移动节点当前是否处于移动状态，例如当MS为1的时 候，则说明移动节点处于移动状态，当然也可以是MS为0的时候指示移动节点为移动状态，不作限定。
对于路由节点来说，如果可以接收到该移动节点发送的DIS消息，则说明该移动节点在该路由节点的通信范围之内，于是该路由节点可以向移动节点发送一个信息对象DIO消息。这样移动节点周围若有多个邻居节点，就可以接收到多个DIO消息。
220、若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中。
具体地，移动节点可以根据邻居节点(候选父节点)发送的DIO消息确定出该候选父节点的目标函数OF值。并将该候选父节点和该候选父节点的OF值都添加到候选父节点列表中。OF值是后续用于确定目标父节点的重要指标。另外，DIO消息的帧结构可以参见图4。DIO消息结构可以包括RPL实例标识(Instance ID)，可以指示DODAG属于哪个RPL实例；包括版本号(Version Number)、随机数(Rank)、接地的(Grounded，G)、运行模式(Mode of Operation，MOP)、DODAG优先级(DODAG Preference)、目的地公告引发序号(Destination Advertisement Trigger Sequence Number，DTSN)、标志(Flags)、移动标志(Mobile Flag，MF)、Reversed位、DODAG标识(128bit IPv6地址，由DODAG根设置，且唯一标识一个DODAG。必须是属于DODAG根的可路由IPv6地址)和选项。其中，MF是用于指示移动节点处于移动状态的指示标志。
需要说明的是，为了保证网络系统的鲁棒性(Robust)，每个邻居节点发送的DIO消息的个数可以是一个或一个以上，本申请实施例不作限定。另外，各个候选父节点的OF值可以通过以下的方式进行确定：
本申请实施例可以通过三个路由度量进行计算，根据的三个路由度量分别是期望传输次数(ETX)、RSSI和剩余能量(RE)可以得到OF值。计算公式如下：
Figure PCTCN2021134549-appb-000001
其中，α、β、γ为权重值，且α+β+γ＝1。每个权重值可以根据优先级 来调整。ETX表示的是当前邻居节点成功传送数据包所需的期望传输次数，计算公式如下。并且ETX max是移动节点所经过的邻居节点中，ETX值最大的节点所对应的ETX值。同理，RSSI max也是移动节点经过的邻居节点中，RSSI值最大的节点对应的RSSI值。RE total则是移动节点所经过的各个邻居节点所剩余能量的总和。其中，移动节点经过的邻居节点，指的是移动节点进入邻居节点的通信范围内。
ETX(N)＝ETX old*β+ETX new*(1-β)
Figure PCTCN2021134549-appb-000002
其中，N表示的是邻居节点的编号，如图1所示的节点1的N为1，节点2的N为2.以此类推。ETX old是节点旧的ETX值，β的默认值为0.9,P s→d是指数据包成功到达接收者的概率，P d→s指的是发送节点成功接收到ACK的概率。RSSI值是用于测量射频收发器的信号功率的度量标准，它反映了节点与邻居节点之间链路的信号强度。RSSI的计算公式如下：
RSSI＝RSSI_VALUE+RSSI_OFFSET
剩余能量可以避免在选择父节点过程中选择能量过低的节点作为最优父节点，计算公式如下：
E c＝V×(T apI ap+T lpI lp+T txI tx+T rxI rx+ΣT niI ni)
其中，T apI ap是节点在活动阶段所消耗的时间和电流，T lpI lp是低功率阶段消耗的时间和电流，T txI tx是传输阶段消耗的时间和电流，T rxI rx是接收节点消耗的时间和电流，T niI ni是感测阶段消耗的时间和电流，V是电压。
230、在从DIS消息定时器计时开始经过该时间段后，检测是否满足通信连接重新建立的条件，若满足，则根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点。
在一种可能的实现方式中，在从DIS消息定时器计时开始经过其指示的时间段后，即DIS消息定时器计时结束后，若检测到当前移动节点正连接于第一父节点，那么就可以获取该第一父节点的OF值。如图5所示，该第一父节点 可以是节点2，“M”为移动节点。在DIS定时器运行结束的时候，移动节点当前连接于第一父节点，且目前还在该第一父节点的通信范围之内。那就说明该第一父节点是DIS消息定时器上一次运行结束后确定的目标父节点，由于在本次DIS消息定时器的运行期间，移动节点发生了位移，那么本次DIS消息定时器运行结束后，候选父节点列表就得到了更新。移动节点可以检测该第一父节点的OF值是否低于预设OF值阈值，若是，则说明该第一父节点已经不能与移动节点进行正常通信，则确定满足通信连接重新建立的条件。而若第一父节点的OF值未低于预设OF值阈值，则说明移动节点还可以和第一父节点进行正常通信，则确定不满足通信连接重新建立的条件。其中，若移动节点确定满足通信连接重新建立的条件，就会重新确定一个新的父节点进行连接。而若第一父节点的OF值未低于预设OF值阈值那么即便移动节点检测到OF值更高的邻居节点，移动节点也不会切换父节点。这可以减少不必要的切换，节省网络资源。
在一种可能的实现方式中，在DIS消息定时器所指示的时间段内，移动节点与第二父节点建立了通信连接。具体为移动节点在DIS消息定时器运行期间内与第二节点连接，且在DIS消息定时器运行结束之前与第二父节点断开。如图6所示，该第二父节点可以是节点2。若移动节点检测到在DIS消息定时器计时开始经过其指示的时间段后，判断在该DIS消息定时器运行结束后所生成的候选父节点列表中，是否包括该第二父节点。若否，则确定满足通信连接重新建立的条件。
可选的，对于如图6所示的情况，若在所述移动节点的信息请求DIS消息定时器指示的时间段内，检测到接收到的第二父节点发送信号的平均信号质量(Average RSSI，ARSSI)低于预设ARSSI值阈值，则可以确定移动节点与第二父节点的通信连接已断开，满足通信连接重新建立的条件。其中，移动节点接收到的第二父节点发送信号的ARSSI低于预设ARSSI值阈值，这种情况称为触发“移动性检测”。需要说明的是，移动节点触发移动性检测则可以确定满足通信连接重新建立的条件。本申请实施例采用加权平均的RSSI值进行移动性检测，移动节点和父节点之间进行信息的交互，通过这些交互信息，周期性计算ARSSI值。如果ARSSI值超过阈值，则说明链路稳定，移动节点与父节 点之间可以继续传输数据；如果ARSSI值低于阈值，那么说明节点之间的链路不稳定，如果此时继续传输数据会引起数据包的丢失。本申请实施例中，ARSSI值的周期可以取为5，即接收到每5个RSSI就计算这5个RSSI的ARSSI值。ARSSI值阈值范围取为[-92dBm,-80dBm]，也就是说该阈值可以根据具体情况进行确定。ARSSI值的计算公式可以是：
Figure PCTCN2021134549-appb-000003
根据以上3种情况移动节点可以确定满足通信连接重新建立的条件。那么移动节点就会在该DIS消息定时器运行结束后从候选父节点列表中确定目标父节点以建立新的通信连接。具体地，移动节点根据候选父节点列表中各个候选父节点对应的OF值，在候选父节点列表所包含的至少一个候选父节点中确定OF值最大的父节点为目标父节点。
240、与目标父节点建立通信连接。
具体地，移动节点可以向目标父节点发送连接DAO消息，向上一个父节点发送断开DAO消息。若移动节点已经离开了上一个父节点的通信范围，则可以向目标父节点发送上一个父节点的断开DAO消息，由该目标父节点将该断开DAO消息转发给上一个父节点。
在一种可能的实现方式中，移动节点与目标父节点建立通信连接实际上是一个链路切换的过程。通常链路切换可以使用软切换的方法。软切换将会采用两种DAO消息进行链路的切换，分别是连接DAO消息和断开DAO消息。连接DAO消息用于连接新的最优父节点，即目标父节点；断开的DAO消息用于删除上一个父节点之间的路径，断开之前的链路。当移动节点选择出自己的最优父节点后，会发送两条及时的DAO消息给旧的父节点(上一个父节点)和新的父节点(目标父节点)。然后，断开DAO消息会删除之前旧的向下路径，连接DAO消息创建新的链路。
在一种可能的实现方式中，软切换为默认的方式，移动节点还可以通过硬切换的方式进行链路切换。硬切换在特定的条件下才会采用，例如在一段时间内(例如：150毫秒)，移动节点没有接收到父节点的任何信息；或者，在断开之前的链路前，在一段时间内没有接收到周围邻居节点的任何信息；又或者 网络繁忙时。
移动节点与目标父节点建立通信连接之后，可以根据目标父节点发送的DIO信息确定第一运行时长。DIS消息定时器每次运行完成之后又会重新开始计时，而每次计时的长度都需要计算得到。该第一运行时长就是DIS消息定时器下次运行的时长。移动节点确定该第一运行时长后，将DIS消息定时器的运行时长更新为该第一运行时长，得到更新后的DIS消息定时器。移动节点就可以在更新后的DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息，触发执行若收到DIO消息，则将发送该DIO消息的邻居节点作为候选父节点，并将该候选父节点添加到候选父节点列表中。这样就可以实现循环检测邻居节点，循环更新候选父节点列表。
在一种可能的实现方式中，确定DIS消息定时器下一次运行时长，即第一运行时长的方法可以通过以下的方式：
根据研究发现，移动节点从一个位置移动到另一个位置时，由于多普勒频率，接收的信号中会存在一个多普勒频率差，这个频率差是多普勒频率。根据多普勒频率，可以找到移动节点的移动方向和速度。设移动节点的移动速度为V m，则移动节点与父节点之间的夹角为θ，电磁波速度为c，多普勒频率为f d，接收频率为f r，那么多普勒频率可由如下公式得到：
Figure PCTCN2021134549-appb-000004
所以移动节点的移动速度V m可以由上式得到：
Figure PCTCN2021134549-appb-000005
当移动节点接近或者退出父节点时，移动节点必须要行进一段距离，这个距离是移动节点离开当前父节点传输范围所需要的时间，然后将离开父节点传输范围所需要的时间定义为DIS消息定时器的时间。如图7展示了移动节点离开当前父节点(节点5)通信范围的示意图。其中图7是以节点5为圆心绘制的该节点5的通信范围；θ是移动节点和其当前父节点之间的角度，d f是移动节点和其当前父节点之间的距离。根据路由器节点发送的多普勒频率可以用边带滤波，偏移载波解调，同向/正交解调等方法来测量移动节点运动的方向。
然后通过利用RSSI值随着距离的变化而变化来估计距离。由于路由器节点发送固定强度的信号，所以可以根据移动节点接收到的衰减信号的强度来估算距离。传输信号中的传输损耗(Loss，L)(单位为dBm)被计算为两个信号之间的差(该差值可以从该父节点发送的DIO消息中确定出)，根据弗里斯自由空间传播模型可以得到：
Figure PCTCN2021134549-appb-000006
其中，λ为电磁波的波长，根据以上公式可以计算出d f，然后再根据余弦定理的第二定律可以计算出d e，计算公式如下：
Figure PCTCN2021134549-appb-000007
DIS消息定时器时间的设定考虑了移动节点在移动过程中的速度和方向的随机性，为了更为精确的设定定时器时间，将时间间隔设定为在[t/2,t]内选择。定时器设置时间I m计算公式如下：
Figure PCTCN2021134549-appb-000008
I m＝x,x∈[t/2,t]
通过以上方法，就可以确定出该DIS消息定时器的I m，即第一运行时长。
在一种可能的实现方式中，移动节点在DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息之后，若未接收到至少一个邻居节点中任一邻居节点发送的DIO消息，则确定移动节点已经离开了当前网络。如图8所示，移动节点当前的通信范围内不存在邻居节点，那就认为已经离开了网络。移动节点可以将该DIS消息定时器的运行时长更新为初始运行时长，得到更新后的DIS消息定时器。移动节点就可以在更新后的DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息，触发执行若收到DIO消息，则将发送该DIO消息的邻居节点作为候选父节点，并将该候选父节点添加到候选父节点列表中。这样就可以实现循环检测邻居节点，循环更新候选父节点列表。
在一种可能的实现方式中，如图9所示为移动节点首次入网的情况，例如移动节点初次开机启动，或者移动节点以在上一次DIS消息定时器的运行期间未连接任一父节点的状态进入当前的网络。若移动节点检测到在DIS消息定时器指示的时间段内，该移动节点未连接任一父节点，则将该DIS消息定时器的运行时长更新为初始运行时长，得到更新后的DIS消息定时器。也就是说，如果移动节点始终检测不到邻居节点以确定目标父节点，那么移动节点就会将DIS消息定时器的运行时长保持为初始运行时长。移动节点可以在更新后的DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息。若接收到了DIO信息，则将发送该DIO消息的邻居节点作为候选父节点，将该候选父节点添加到候选父节点列表中。当该更新后的DIS消息定时器计时开始经过其指示的时间段后，移动节点就可以根据候选父节点列表中各个候选父节点对应的OF值，在候选父节点列表包含的至少一个候选父节点中确定目标父节点，与该目标父节点建立通信连接。
通过本申请实施例，移动节点可以在DIS消息定时器指示的时间段内向至少一个邻居节点发送DIS消息，若接收到了DIO消息，则可以确定当前网络中存在邻居节点。移动节点可以将发送DIO消息的邻居节点作为候选父节点，并计算该候选父节点的OF值，将两者添加到候选父节点列表中。当DIS消息定时器运行结束后，则可以检测是否需要选择新的父节点(目标父节点)建立连接，若是，则可以根据候选父节点列表中各个候选父节点的OF值来确定目标父节点，并与其建立通信连接。通过该方法，可以使移动节点可以在网络中持续寻找邻居节点，并在需要切换到新的父节点的情况下快速确定目标父节点以建立通信连接，可以提高无线移动通信的效率和稳定性。
请参见图10，图10为本申请实施例提供的一种触发移动性检测的流程示意图。当移动节点执行图10的流程时，可以包括以下步骤：
1010、周期性采集RSSI值计算ARSSI值。
1020、判断ARSSI值是否高于ARSSI值阈值。
1030、若是，则继续与当前父节点保持连接。
当ARSSI值高于ARSSI值阈值，则说明链路稳定，移动节点与父节点之 间可以继续传输数据。
1040、若否，则触发移动性检测，选择新的父节点建立通信连接。
如果ARSSI值低于阈值，那么说明节点之间的链路不稳定，如果此时继续传输数据会引起数据包的丢失。
通过该方法，移动节点可以在ARSSI值低于ARSSI值阈值的情况下触发移动性检测，以根据候选父节点列表确定目标父节点，该目标父节点即新的父节点，与该新的父节点建立连接，以保证移动节点及时接入网络。
请参见图11，图11为本申请实施例提供的一种DIS消息定时器更新运行时长方法的流程示意图。当移动节点执行图11的流程时，可以包括以下步骤：
1110、在DIS消息定时器指示的时间段内，广播DIS消息以请求DIO消息。
1120、若确定目标父节点，则根据该目标父节点的DIO消息，计算移动节点的移动速度和方向。
1130、计算移动节点离开该目标父节点通信范围的距离。
1140、计算时间间隔，更新DIS消息定时器。
该时间间隔即为移动节点离开该目标父节点通信范围的距离d e与移动节点的移动速度V m的比值。
1150、运行更新后的DIS消息定时器。
需要说的是，若移动节点在DIS消息定时器指示的时间段后，未确定新的父节点，那么DIS消息定时器的运行时长可以与上一次运行的运行时长保持一致。此处可以描述为将DIS消息定时器的运行时长更新为上一次DIS消息定时器的运行时长。
通过该方法，DIS消息定时器可以及时得到更新，移动节点可以在DIS消息定时器内持续广播DIS消息，以请求DIO消息。这样就可以实时更新候选父节点列表，以便移动节点可以及时在需要的时候连接到新的父节点，提高无线移动通信的效率和稳定性。
请参见图12，图12为本申请实施提供的一种确定目标父节点的流程示意 图。当移动节点执行图11的流程时，可以包括以下步骤：
1210、开启DIS消息定时器。
若移动节点在上一次DIS消息定时器运行期间未连接任何父节点，则确定DIS消息定时器为初始运行时长。
1220、广播DIS消息，接收DIO消息。
1230、判断DIS消息定时器是否到期，或移动节点是否触发移动性检测。
1240、若DIS消息定时器未到期，且移动节点未触发移动性检测，移动节点连接于某父节点，则继续通过该父节点传输数据。
1250、若DIS消息定时器到期，或移动节点触发移动性检测，则判断是否需要确定新的父节点建立通信连接。
1260、若需要确定新的父节点建立通信连接，则根据候选父节点列表确定目标父节点。
1270、更新DIS消息定时器。
若由步骤1250执行过来，则说明不需要确定新的父节点建立通信连接。此处更新DIS消息定时器，DIS消息定时器的运行时长并没有改变。若DIS消息定时器到期后，移动节点未收到任何DIO消息，则确定移动节点离开网络，将DIS消息定时器的运行时长更新为初始运行时长。
若由步骤1260执行过来，则说明移动节点已连接到目标父节点中，可以根据该目标父节点的DIO消息来确定下一次DIS消息定时器的运行时长，并更新该DIS消息定时器。
通过该方法，移动节点可以在DIS消息定时器指示的时间段内向至少一个邻居节点发送DIS消息，若接收到了DIO消息，则可以确定当前网络中存在邻居节点。移动节点可以将发送DIO消息的邻居节点作为候选父节点，并计算该候选父节点的OF值，将两者添加到候选父节点列表中。当DIS消息定时器运行结束后，则可以检测是否需要选择新的父节点(目标父节点)建立连接，若是，则可以根据候选父节点列表中各个候选父节点的OF值来确定目标父节点，并与其建立通信连接。通过该方法，可以使移动节点可以在网络中持续寻找邻居节点，并在需要切换到新的父节点的情况下快速确定目标父节点以建立通信连接，可以提高无线移动通信的效率和稳定性。
请参见图13，图13为本申请实施例提供的在无线移动通信装置的单元示意图。图13所示的无线移动通信装置可以用于执行上述图2、图10、图11和图12所描述的方法实施例中的部分或全部功能。该装置可以是移动节点，也可以是移动节点中的装置，或者是能够和移动节点匹配使用的装置。
该装置的逻辑结构可包括：通信单元1310、处理单元1320和连接单元1330。当该装置被应用于移动节点时：
通信单元1310，用于在移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；
处理单元1320，用于若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中；
上述处理单元1320还用于在从DIS消息定时器计时开始经过该时间段后，检测是否满足通信连接重新建立的条件，若满足，则根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点；
连接单元1330，用于与目标父节点建立通信连接。
在一种可能的实现方式中，上述处理单元1320还用于根据候选父节点发送的DIO消息确定候选父节点的目标函数OF值；将候选父节点和候选父节点的OF值添加到候选父节点列表中。
在一种可能的实现方式中，上述处理单元1320还用于在从DIS消息定时器计时开始经过该时间段后，若检测到移动节点当前连接于第一父节点，则获取第一父节点的OF值；检测第一父节点的OF值是否低于预设OF值阈值，若是，则确定满足通信连接重新建立的条件。
在一种可能的实现方式中，移动节点在移动节点的信息对象DIS消息定时器指示的时间段内与第二父节点建立了通信连接。
在一种可能的实现方式中，在从DIS消息定时器计时开始经过该时间段后，上述处理单元1320还用于检测候选父节点列表中是否包括第二父节点，若否，则确定满足通信连接重新建立的条件。
在一种可能的实现方式中，移动节点在移动节点的信息对象DIS消息定时 器指示的时间段内与第二父节点建立了通信连接。
在一种可能的实现方式中，若在移动节点的信息请求DIS消息定时器指示的时间段内，上述处理单元1320还用于检测到移动节点接收到的第二父节点发送信号的平均信号质量ARSSI值低于预设ARSSI值阈值，则确定满足通信连接重新建立的条件。
在一种可能的实现方式中，上述处理单元1320还用于若检测到在移动节点的DIS消息定时器指示的时间段内，移动节点未连接任一父节点，则将DIS消息定时器的运行时长更新为初始运行时长，得到更新后的DIS消息定时器；在更新后的DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中；在从更新后的DIS消息定时器计时开始经过该时间段后，根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点；上述连接单元1330还用于与目标父节点建立通信连接。
在一种可能的实现方式中，上述处理单元1320还用于根据候选父节点列表中各个候选父节点对应的OF值，在候选父节点列表所包含的至少一个候选父节点中确定OF值最大的候选父节点为目标父节点。
在一种可能的实现方式中，根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点之后，上述处理单元1320还用于根据目标父节点发送的DIO消息确定第一运行时长；将DIS消息定时器的运行时长更新为第一运行时长，得到更新后的DIS消息定时器；在更新后的DIS消息定时器指示的时间段内，上述通信单元1310还用于向至少一个邻居节点发送DIS消息，触发处理单元1320执行若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中。
在一种可能的实现方式中，在移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息之后，上述处理单元1320还用于若未接收到至少一个邻居节点中任一邻居节点发送的DIO消息，则将DIS消息定时器的运行时长更新为初始运行时长，得到更新后的DIS消息定时器； 在更新后的DIS消息定时器指示的时间段内，上述通信单元1310还用于向至少一个父节点发送DIS消息，触发处理单元1320执行若接收到通告DIO消息，则将发送DIO消息的父节点作为候选父节点，并将候选父节点添加到候选父节点列表中。
在一种可能的实现方式中，DIS消息包括用于指示移动节点处于移动状态的标识MS，DIO消息包括用于指示移动节点处于移动状态的标识MF。
请参见图14，图14为本申请实施例提供的一种无线移动通信装置的实体结构简化示意图，该装置包括处理器1410、存储器1420和通信接口1430，该处理器1410、存储器1420以及通信接口1430通过一条或多条通信总线连接。
处理器1410被配置为支持无线移动通信装置执行图2、图10、图11和图12中方法相应的功能。应理解，本申请实施例中，所述处理器1410可以为中央处理单元(central processing unit，简称CPU)，该处理器还可以是其他通用处理器、数字信号处理器(digital signal processor，简称DSP)、专用集成电路(application specific integrated circuit，简称ASIC)、现成可编程门阵列(field programmable gate array，简称FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
存储器1420用于存储程序代码等。本申请实施例中的存储器1420可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，简称ROM)、可编程只读存储器(programmable ROM，简称PROM)、可擦除可编程只读存储器(erasable PROM，简称EPROM)、电可擦除可编程只读存储器(electrically EPROM，简称EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，简称RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(random access memory，简称RAM)可用，例如静态随机存取存储器(static RAM，简称SRAM)、动态随机存取存储器(DRAM)、同步动态随机存取存储器(synchronous DRAM，简称SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM， 简称DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，简称ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，简称SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，简称DR RAM)。
通信接口1430用于收发数据、信息或消息等，也可以描述为收发器、收发电路等。
在本申请实施例中，当该无线移动通信装置应用于移动节点时，该处理器1410调用存储器1420中存储的程序代码以执行以下操作：
控制通信接口1430在移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；
处理器1410调用存储器1420中存储的程序代码若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中；
处理器1410调用存储器1420中存储的程序代码在从DIS消息定时器计时开始经过该时间段后，检测是否满足通信连接重新建立的条件，若满足，则根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点；
控制通信接口1430与目标父节点建立通信连接。
在一种可能的实现方式中，处理器1410调用存储器1420中存储的程序代码根据候选父节点发送的DIO消息确定候选父节点的目标函数OF值；将候选父节点和候选父节点的OF值添加到候选父节点列表中。
在一种可能的实现方式中，处理器1410调用存储器1420中存储的程序代码在从DIS消息定时器计时开始经过该时间段后，若检测到移动节点当前连接于第一父节点，则获取第一父节点的OF值；检测第一父节点的OF值是否低于预设OF值阈值，若是，则确定满足通信连接重新建立的条件。
在一种可能的实现方式中，移动节点在移动节点的信息对象DIS消息定时器指示的时间段内与第二父节点建立了通信连接。
在一种可能的实现方式中，在从DIS消息定时器计时开始经过该时间段后，处理器1410调用存储器1420中存储的程序代码检测候选父节点列表中是否包 括第二父节点，若否，则确定满足通信连接重新建立的条件。
在一种可能的实现方式中，移动节点在移动节点的信息对象DIS消息定时器指示的时间段内与第二父节点建立了通信连接。
在一种可能的实现方式中，若在移动节点的信息请求DIS消息定时器指示的时间段内，处理器1410调用存储器1420中存储的程序代码检测到移动节点接收到的第二父节点发送信号的平均信号质量ARSSI值低于预设ARSSI值阈值，则确定满足通信连接重新建立的条件。
在一种可能的实现方式中，处理器1410调用存储器1420中存储的程序代码若检测到在移动节点的DIS消息定时器指示的时间段内，移动节点未连接任一父节点，则将DIS消息定时器的运行时长更新为初始运行时长，得到更新后的DIS消息定时器；在更新后的DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中；在从更新后的DIS消息定时器计时开始经过该时间段后，根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点；控制通信接口1430与目标父节点建立通信连接。
在一种可能的实现方式中，处理器1410调用存储器1420中存储的程序代码根据候选父节点列表中各个候选父节点对应的OF值，在候选父节点列表所包含的至少一个候选父节点中确定OF值最大的候选父节点为目标父节点。
在一种可能的实现方式中，根据候选父节点列表中各个候选父节点对应的目标函数OF值，在候选父节点列表所包含的至少一个候选父节点中确定目标父节点之后，处理器1410调用存储器1420中存储的程序代码根据目标父节点发送的DIO消息确定第一运行时长；将DIS消息定时器的运行时长更新为第一运行时长，得到更新后的DIS消息定时器；在更新后的DIS消息定时器指示的时间段内，控制通信接口1430向至少一个邻居节点发送DIS消息，触发处理器1410调用存储器1420中存储的程序代码执行若接收到信息对象DIO消息，则将发送DIO消息的邻居节点作为候选父节点，并将候选父节点添加到候选父节点列表中。
在一种可能的实现方式中，在移动节点的信息请求DIS消息定时器指示的 时间段内，向至少一个邻居节点发送DIS消息之后，处理器1410调用存储器1420中存储的程序代码若未接收到至少一个邻居节点中任一邻居节点发送的DIO消息，则将DIS消息定时器的运行时长更新为初始运行时长，得到更新后的DIS消息定时器；在更新后的DIS消息定时器指示的时间段内，控制通信接口1430向至少一个父节点发送DIS消息，触发处理器1410调用存储器1420中存储的程序代码执行若接收到通告DIO消息，则将发送DIO消息的父节点作为候选父节点，并将候选父节点添加到候选父节点列表中。
在一种可能的实现方式中，DIS消息包括用于指示移动节点处于移动状态的标识MS，DIO消息包括用于指示移动节点处于移动状态的标识MF。
需要说明的是，在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详细描述的部分，可以参见其他实施例的相关描述。
本发明实施例方法中的步骤可以根据实际需要进行顺序调整、合并和删减。
本发明实施例处理设备中的单元可以根据实际需要进行合并、划分和删减。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例的流程或功能。计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线)或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。可用介质可以是磁性介质，(例如，软盘、存储盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态存储盘Solid State Disk(SSD))等。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术 人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。
关于上述实施例中描的各个装置、产品包含模块/单元，其可以是软件模块/单元，也可以是硬件模块/单元，或者也可以部分是软件模块/单元，部分是硬件模块/单元。例如，对于应用或集成芯片的各个装置、产品其包含的各个模块/单元可以都采用电路等硬件的方式实现，或者至少部分模块/单元可以采用软件程序的方式实现，该运行于芯片内部集成处理器，剩余的部分模块/单元可以采用电路等硬件方式实现；对于应于或集成芯片模组的各个装置、产品，其包含的各个模块/单元可以都采用电路等硬件的方式实现，不同模块/单元可以位于芯片模组的同一件(例如片、电路模块等)或者不同组件中，至少部分/单元可以采用软件程序的方式实现，该软件程运行于芯片模组内部集成处理器剩余部分模块/单元可以采用电路等硬件方式实现；对于应或集成终端的各个装置、产品，其包含的模块/单元可以都采用电路等硬件的方式实现，不同的模块/单元可以位于终端内同一组件(例如，芯片、电路模块等)或者不同组件中，或者至少部分模块/单元可以采用软件程序的方式实现，该序运行于终端内部集成的处理器，剩余分模块/单元可以采用电路等硬件方式实现。

Claims (14)

  1. 一种无线移动通信方法，其特征在于，应用于移动节点，所述方法包括：
    在所述移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；
    若接收到信息对象DIO消息，则将发送所述DIO消息的邻居节点作为候选父节点，并将所述候选父节点添加到候选父节点列表中；
    在从所述DIS消息定时器计时开始经过所述时间段后，检测是否满足通信连接重新建立的条件，若满足，则根据所述候选父节点列表中各个候选父节点对应的目标函数OF值，在所述候选父节点列表所包含的至少一个候选父节点中确定目标父节点；
    与所述目标父节点建立通信连接。
  2. 根据权利要求1所述的方法，其特征在于，所述将所述候选父节点添加到候选父节点列表中，包括：
    根据所述候选父节点发送的所述DIO消息确定所述候选父节点的目标函数OF值；
    将所述候选父节点和所述候选父节点的OF值添加到所述候选父节点列表中。
  3. 根据权利要求1所述的方法，其特征在于，所述在从所述DIS消息定时器计时开始经过所述时间段后，检测是否满足通信连接重新建立的条件，包括：
    在从所述DIS消息定时器计时开始经过所述时间段后，若检测到所述移动节点当前连接于第一父节点，则获取所述第一父节点的OF值；
    检测所述第一父节点的OF值是否低于预设OF值阈值，若是，则确定满足所述通信连接重新建立的条件。
  4. 根据权利要求1所述的方法，其特征在于，所述移动节点在所述移动节点的信息对象DIS消息定时器指示的时间段内与第二父节点建立了通信连接；
    所述在从所述DIS消息定时器计时开始经过所述时间段后，检测是否满足通信连接重新建立的条件，包括：
    在从所述DIS消息定时器计时开始经过所述时间段后，检测所述候选父节点列表中是否包括所述第二父节点，若否，则确定满足所述通信连接重新建立的条件。
  5. 根据权利要求1所述的方法，其特征在于，所述移动节点在所述移动节点的信息对象DIS消息定时器指示的时间段内与第二父节点建立了通信连接；
    所述方法还包括：
    若在所述移动节点的信息请求DIS消息定时器指示的时间段内，检测到所述移动节点接收到的所述第二父节点发送信号的平均信号质量ARSSI值低于预设ARSSI值阈值，则确定满足所述通信连接重新建立的条件。
  6. 根据权利要求1所述方法，其特征在于，所述方法还包括：
    若检测到在所述移动节点的DIS消息定时器指示的时间段内，所述移动节点未连接任一父节点，则将所述DIS消息定时器的运行时长更新为初始运行时长，得到更新后的DIS消息定时器；
    在所述更新后的DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息；
    若接收到信息对象DIO消息，则将发送所述DIO消息的邻居节点作为候选父节点，并将所述候选父节点添加到候选父节点列表中；
    在从所述更新后的DIS消息定时器计时开始经过所述时间段后，根据所述候选父节点列表中各个候选父节点对应的目标函数OF值，在所述候选父节点列表所包含的至少一个候选父节点中确定目标父节点；
    与所述目标父节点建立通信连接。
  7. 根据权利要求3～5任意一项所述的方法，其特征在于，所述根据所述候选父节点列表中各个候选父节点对应的OF值，在所述候选父节点列表所包含的至少一个候选父节点中确定目标父节点，包括：
    根据所述候选父节点列表中各个候选父节点对应的OF值，在所述候选父节点列表所包含的至少一个候选父节点中确定OF值最大的候选父节点为所述目标父节点。
  8. 根据权利要求1所述的方法，其特征在于，所述根据所述候选父节点列表中各个候选父节点对应的目标函数OF值，在所述候选父节点列表所包含的至少一个候选父节点中确定目标父节点之后，所述方法还包括：
    根据所述目标父节点发送的DIO消息确定第一运行时长；
    将所述DIS消息定时器的运行时长更新为所述第一运行时长，得到更新后的DIS消息定时器；
    在所述更新后的DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息，触发执行所述若接收到信息对象DIO消息，则将发送所述DIO消息的邻居节点作为候选父节点，并将所述候选父节点添加到候选父节点列表中。
  9. 根据权利要求1所述的方法，其特征在于，在所述移动节点的信息请求DIS消息定时器指示的时间段内，向至少一个邻居节点发送DIS消息之后，所述方法还包括：
    若未接收到所述至少一个邻居节点中任一邻居节点发送的DIO消息，则将所述DIS消息定时器的运行时长更新为初始运行时长，得到更新后的DIS消息定时器；
    在所述更新后的DIS消息定时器指示的时间段内，向至少一个父节点发送DIS消息，触发执行所述若接收到通告DIO消息，则将发送所述DIO消息的父节点作为候选父节点，并将所述候选父节点添加到候选父节点列表中。
  10. 根据权利要求1所述的方法，其特征在于，所述DIS消息包括用于指示所述移动节点处于移动状态的标识MS，所述DIO消息包括用于指示所述移动节点处于移动状态的标识MF。
  11. 一种无线移动通信装置，其特征在于，包括处理器、存储器和通信接口，所述处理器、所述存储器和所述通信接口相互连接，其中，所述存储器用于存储计算机程序，所述计算机程序包括程序指令，所述处理器被配置用于调用所述程序指令，执行如权利要求1至10中任一项所述的无线移动通信方法。
  12. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有一条或多条指令，所述一条或多条指令适于由处理器加载并执行如权利要求1至10中任一项所述的无线移动通信方法。
  13. 一种芯片，其特征在于，所述芯片包括处理器与接口，所述处理器和所述接口耦合；所述接口用于接收或输出信号，所述处理器用于执行代码指令，以使权利要求1至10中任一项所述的方法被执行。
  14. 一种模组设备，其特征在于，所述模组设备包括通信模组、电源模组、存储模组以及芯片模组，其中：
    所述电源模组用于为所述模组设备提供电能；
    所述存储模组用于存储数据和指令；
    所述通信模组用于进行模组设备内部通信，或者用于所述模组设备与外部设备进行通信；
    所述芯片模组用于执行如权利要求1至10任一项所述的方法。
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