CN107801196B - Method and system for detecting off-line node - Google Patents
Method and system for detecting off-line node Download PDFInfo
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- CN107801196B CN107801196B CN201610805683.7A CN201610805683A CN107801196B CN 107801196 B CN107801196 B CN 107801196B CN 201610805683 A CN201610805683 A CN 201610805683A CN 107801196 B CN107801196 B CN 107801196B
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Abstract
The invention discloses a method and a system for detecting off-line nodes, and relates to the field of mobile ad hoc networks. The method comprises the following steps: the initiating node sends a detection message to the target node through the cluster head node grouped by the mobile self-organizing network so as to search the target node; the target group head node sends a response message to the initiating node to inform the mobile ad hoc network grouping where the abnormal target node is; before the initiating node does not receive the feedback message of the target node, the initiating node sends a detection message of the target node to the target cluster head node so that the target cluster head node can detect the target node; and if the feedback message of the target node is not received within the preset time, the initiating node determines that the target node is off-line. Therefore, the detection of the off-line node is realized more quickly and effectively.
Description
Technical Field
The invention relates to the field of self-organizing networks, in particular to a method and a system for detecting off-line nodes.
Background
If a node i of a MANET (Mobile Ad hoc Network) Network suddenly takes off the Network, other Network nodes have no chance to receive an address clearing message of the off-Network node i, when an initiating node j configures an IP address for a requesting node, the initiating node j still expects to receive the response of the suddenly off-Network node i before a request response timer is overtime because the IP address of the node i is still in a member node list, but the initiating node j must not receive the response of the node i because the node i is already off the Network. By repeatedly sending the request message, and after the number of times of repetition reaches the set threshold number of times, it can be judged that the node i has suddenly disconnected. Sudden off-line nodes can be detected during the initialization of an IP address assignment.
When the initiating node j does not receive the response of the node i, the following 4 reasons may be caused: 1) suddenly disconnecting the node i; 2) the start request message sent by node j is lost; 3) the response of node i is lost; 4) the message propagation delay is very long. If the message is lost, the response of the node i needs to be obtained by resending the message, and the problems of node configuration address conflict and IP address loophole are solved. The problems of node configuration address conflict and IP address loophole caused by message loss can be solved by setting a sequence number for each IP address.
In order to avoid sudden network disconnection of the misjudged node j caused by message loss due to node failure, signal collision, communication quality deterioration and the like, the initiating node needs to set a maximum number of continuous repetition times N which is sufficiently large. In order to avoid misjudgment caused by excessively long message propagation delay, a timer T with a sufficient length needs to be set. Factors that may cause the message propagation delay to be too long may include: network node self-failure, re-clustering, network congestion, propagation environment degradation, multi-hop forwarding, etc.
The cluster head connection technique can connect all nodes with a probability close to 1, and the reliability is highest among all transmission routes, so that the optimal transmission route of the message is transmitted via the cluster head. That is, a node j needs to send a message to a node i without knowing the routing information, and the process of the group head transmission is as follows: node j sends a message to its clusterhead that contains the ID of node i. If node i is not in the cluster of node j, the cluster head of node j broadcasts the message to the neighboring cluster heads. After receiving the message, the first neighbor cluster checks whether there is a node i in its member table. The above-described inspection is performed in parallel for each of the adjacent clusterheads. If a certain adjacent cluster head finds the node i and sends the message to the node i, the node i feeds back a response to the node j through the cluster head. If node i is not found, the neighbor cluster head broadcasts a message to the two-hop neighbor cluster head of the cluster head of node j. This process continues in turn until a message is sent to the inode. If the sending node j cannot receive the response of the node i, the sending node j repeatedly sends the starting request message and resets the timer T, so that the address distribution time delay of the sudden off-line node is determined to be N x T, and the time is longer.
Disclosure of Invention
The invention aims to solve the technical problems that: how to rapidly and effectively realize the detection of the off-line node.
According to an aspect of the embodiments of the present invention, there is provided a method for detecting a offline node, including: the initiating node sends a detection message to the target node through the cluster head node grouped by the mobile self-organizing network so as to search the target node; the target group head node sends a response message to the initiating node to inform the mobile ad hoc network grouping where the abnormal target node is; before the initiating node does not receive the feedback message of the target node, the initiating node sends a detection message of the target node to the target cluster head node so that the target cluster head node can detect the target node; and if the feedback message of the target node is not received within the preset time, the initiating node determines that the target node is off-line.
According to another aspect of the embodiments of the present invention, a system for detecting a node off-line is provided, which includes a plurality of ad hoc network clusters, each ad hoc network cluster including a cluster head node and a member node, wherein an initiating node is configured to send a detection message to a target node through the cluster head node of the mobile ad hoc network cluster to search for the target node; the target node detection device is used for sending a detection message of the target node to the target cluster head node before receiving the feedback message of the target node so as to facilitate the target cluster head node to detect the target node; the target node is determined to be offline when the feedback message of the target node is not received within the preset time; the initiating node is a cluster head node or a member node; the target node is a member node; the target cluster head node is used for responding to the detection message of the target node, and the target cluster head node sends a response message to the initiating node so as to inform the mobile ad hoc network cluster where the abnormal target node is located.
The initiating node sends a detection message to the target node through the cluster head node of the mobile self-organizing network cluster so as to search the target node and send a response message to the initiating node by the target cluster head node so as to inform the mobile self-organizing network cluster of the abnormal target node; before the initiating node does not receive the feedback message of the target node, the initiating node sends a detection message of the target node to the target cluster head node so that the target cluster head node can detect the target node; if the feedback message of the target node is not received within the preset time, the initiating node determines that the target node is off-line, so that the time delay for determining the suddenly off-line node is reduced.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic diagram of a system for detecting a talk-around node according to the invention.
Fig. 2 is a flow chart illustrating an embodiment of the method for detecting a talk-around node according to the present invention.
Fig. 3 illustrates a method for an originating node to send a detection message of a target node to a clusterhead node that is clustered in an ad hoc network.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The system for detecting the off-line nodes comprises a plurality of self-organization network subgroups, and each self-organization network subgroup comprises a group head node and a member node. Fig. 1 shows a schematic diagram of a system for detecting a talk-around node according to the invention. For example, as shown in fig. 1, the system includes a plurality of ad hoc network clusters, each ad hoc network cluster includes a head node, a member node, and further may include a gateway (or gateway node). The cluster head node can connect all member nodes and gateways within the present cluster with a probability of approximately 1. The gateways can connect different groups. As shown in fig. 1, an initiating node j and a target node i as member nodes are respectively located in two different clusters, and a cluster head node of the cluster where the target node i is located is a cluster head node k. Since the head node can connect all member nodes in the cluster with a probability close to 1, the head node k can connect the target node i with a probability close to 1. The initiating node j can directly communicate with the cluster head node k through the gateway a and the gateway b, and the cluster head node k detects whether the target node i is offline.
A method for detecting a talk-around node according to an embodiment of the present invention is described below with reference to fig. 1 and 2.
Fig. 2 is a flow chart illustrating an embodiment of the method for detecting a talk-around node according to the present invention. As shown in fig. 2, the method for detecting a offline node in this embodiment includes the following steps:
step S202, the initiating node sends a detection message to the target node through the cluster head node of the mobile self-organizing network to search the target node.
The initiating node can send the detection message of the target node to the cluster head of the ad hoc network cluster where the target node is located in a flooding mode. Specifically, the initiating node broadcasts a detection message of the target node, and after receiving the detection message of the target node, the cluster head node of the ad hoc network cluster where the initiating node is located detects whether the target node exists in the cluster. If the cluster head node of the ad hoc network cluster where the initiating node is located detects that the target node does not exist in the cluster, the cluster head node of the ad hoc network cluster where the initiating node is located broadcasts a detection message of the target node to two-hop adjacent cluster head nodes of the cluster head of the initiating node, so that the two-hop adjacent cluster head nodes of the cluster head of the initiating node can detect whether the target node exists in the cluster. If the target node is not detected in the local cluster by the two-hop adjacent cluster head node of the cluster head of the initiating node, the detection message of the target node is continuously broadcasted to the three-hop adjacent cluster head node of the cluster head of the initiating node, and the steps of broadcasting and detecting are continued until the target cluster head node of the self-organizing network cluster where the target node is located is found. The execution sequence of the broadcasting and detecting steps may be adjusted, for example, the detecting message may also be broadcast, and the target node is searched in the present cluster, which will be described in detail later with reference to fig. 3.
Step S204, the target group head node sends a response message to the initiating node to inform the mobile self-organizing network grouping of the abnormal target node.
If the target node receives the detection message, the target node can feed back the message to the initiating node through the gateway node and indicate that the target node is on the network to the initiating node. And if the target cluster head node does not receive the feedback message of the target node after the preset time value, the target cluster head node sends a response message of the abnormity of the target node to the initiating node.
Step S206, the initiating node sends the detection message of the target node to the target cluster head node before receiving the feedback message of the target node, so that the target cluster head node can detect whether the target node is off-line.
The initiating node can directly send the detection message of the target node to the target cluster head node, and does not need to send the detection message of the target node to the target cluster head node in a flooding mode, so that the detection message can reach the target cluster head node more quickly, and then the target cluster head node detects whether the target node is off-line.
Preferably, the initiating node may send the detection message of the target node to the target cluster head node through the shortest path between the initiating node and the target cluster head node. The message propagation route selects the shortest path, the propagation delay is shortest, the time delay for determining the suddenly off-line node is further shortened, and the resource consumption of the network is reduced.
And step S208, if the feedback message of the target node is not received within the preset time, the initiating node determines that the target node is offline.
The initiating node may record the time value elapsed from the sending of the target node detection message to the receipt of the target node feedback message or the target node abnormal response message. And if the time value is larger than a preset time threshold, the target node can be considered to be offline.
An application example of the method of detecting a off-grid node of the present invention is described below with reference to fig. 1.
When the initiating node j sends a starting request message for the first time, the serial number of the starting request message is 0 and contains the ID of the target node i, and the time length of the timer is set to be T0. The initiating node j sends the serial number asThe start request message of 0 is sent to the cluster head node, if the target node i is not in the cluster of the initiating node j, the cluster head node of the initiating node j broadcasts the message to the adjacent cluster head node. After receiving the message, the first node of the adjacent group checks whether a target node i exists in the member table. The above-described check is performed in parallel by each of the neighboring cluster head nodes. And if one adjacent cluster head node finds the target node i and forwards the message to the target node i, the target node i feeds back a response to the initiating node j through the cluster head node. If the target node i is not found, the adjacent cluster head node broadcasts the message to the two-hop adjacent cluster head node of the initiating node j. This process continues in turn until the message is forwarded to the target node i.
In the process of starting the propagation of the request message with the sequence number 0, the cluster head node of the target node i may forward the message to the target node i after receiving the message, but the response of the target node i cannot be received. If the cluster head node k finds that the target node i is in the cluster, but the response of the target node i cannot be received within the overtime, the cluster head node k sends a message to the initiating node j, and states that the target node i is in the cluster, and the response cannot be received within the overtime.
After the initiating node j receives the declaration response of the cluster head node k, the initiating node j only sends a retransmission message with the sequence number of 1 to the cluster head node k through the gateway a and the gateway b, and the time length of the timer is set to be T1And satisfy T1Less than T0, and so on until the number of messages sent by originating node j reaches a maximum of N consecutive repetitions.
If at the preset time T0+(N-1)T1If the response of the target node i is not received, the target node i is judged to be suddenly disconnected.
In the above embodiment, different methods for detecting message routing and presetting corresponding time by a timer are adopted, and a group head node between an initiating node j and a target group head node k does not need to check a member list, so that the time delay for determining a sudden offline node is reduced, and the resource consumption of a network is obviously reduced.
The method for the initiating node to send the detection message of the target node to the cluster head node of the ad hoc network cluster is described below with reference to fig. 3. As shown in fig. 3, the step S202 may include the following steps:
step S3022, the initiating node sends the detection message of the target node to the cluster head node of each ad hoc network cluster in a flooding manner.
Step S3024, the cluster head node that receives the detection message of the target node broadcasts the detection message of the target node to the neighboring cluster head node, and meanwhile, searches whether the target node exists in the local cluster.
For example, if the initiating node j does not receive a response from the target node i after the first timeout and also receives a response from the cluster head node where the target node i is located, the initiating node j sends a startup request message with a sequence number N (N is 1,2, …, N-1), sets the timer duration to Tn, and satisfies Tn < T0. After receiving the starting request message with the sequence number n, the adjacent cluster head broadcasts the message to the next hop adjacent cluster head node, and simultaneously checks whether the target node i is in the cluster, and continues to the last hop cluster head node.
In the above embodiment, if the initiating node j does not receive the response of the target node i after the first timeout, and also does not receive the response of the cluster head node where the target node i is located, and the initiating node j still cannot determine the location of the cluster where the target node i is located, the priority of sending the start message to the cluster head node where the target node i is located is the highest, and then the start message is sent to the target node i, so that the cluster head node may directly broadcast the message to the next-hop neighboring cluster head node without waiting for the check result in the flooding process. Since the head node of the target node i does not need to wait for the previous checking results of the plurality of head nodes before receiving the message with the sequence number of non-0 when the initiating node j floods the start request message with the sequence number of non-0, the saved time T0-T1 is the sum of the time required by each head node between the cluster where the initiating node j is located and the cluster where the target node i is located to search the target node i in the member list. Thus, determining that the address assignment delay of a sudden off-net node is equal to T0+T1+T2+…+TN-1. If at the preset time T0+T1+T2+…+TN-the target node i's response is not received in 1And if so, the target node i is judged to be suddenly disconnected, and the time delay for determining the suddenly disconnected node is further shortened.
Optionally, the detecting, by the target cluster head node, the target node includes: the target group head node finds the grouping where the target node changes; the target group head node sends a target node grouping change message to the initiating node; and the initiating node searches the target cluster head node of the self-organizing network cluster where the target node is located by sending the detection message of the target node to the cluster head node of the self-organizing network cluster again.
For example, in subsequent operations, the cluster where the target node i is located changes the cluster head node, the original cluster head node k hands over the detection task of the initiating node j to the new cluster head node l, and the new cluster head node l forwards a message to the target node i, and sends a statement or a forwarding response to the initiating node j instead of the original cluster head node k. The message sequence number of the initiating node j and the value of the timer duration follow the established rules and are not affected by the rules.
For another example, in subsequent operations, the target node i changes the clustering or changes the clustering ID, the cluster head node k sends a statement to the initiating node j that the target node i is not in the clustering, and the initiating node j resets the start request message with the maximum number of consecutive repetitions of N, the flooding message sequence number of 0, and the timer duration of T0 to all cluster head nodes.
In the above embodiment, when the target node is changed and clustered, and the like, the target cluster head node sends the target node clustering change message to the initiating node, and the initiating node sends the detection message of the target node to the cluster head node of the ad hoc network clustering again, so that the influence of the abnormal condition of the target node on the detection result is eliminated.
Optionally, if the target cluster head node is changed from the original target cluster head node to a new target cluster head node, the new target cluster head node replaces the original target cluster head node to perform target node detection, so as to ensure continuous performance of the detection process.
For example, in subsequent operations, the initiating node j normally disconnects from the network in the detection process because the cluster head node k where the target node i is located is not changed in the cluster ID, and the initiating node j receives a message that the cluster head node k normally disconnects from the network and sends a message with a sequence number of not 0 to a new cluster head of the same cluster ID. The new group head node l of the target node i receives the starting request message with the sequence number being not 0, after the target node i is detected to be in the group, the detection can be judged to be incomplete, and the new group head node l replaces the original group head node k to forward the message to the target node i and sends a statement or a forwarding response to the initiating node j. The message sequence number of the initiating node j and the value of the timer duration follow the established rules and are not affected by the rules.
Optionally, if the original target cluster head node suddenly drops off the network so that the target cluster head node is changed into a new target cluster head node, the new target cluster head node sends a response message that the original target cluster head node is abnormal to the initiating node. And resetting the preset time after the initiating node receives a response message of the abnormity of the original target cluster head node sent by the new target cluster head node.
For example, in subsequent operations, the initiating node j suddenly drops off the network in the detection process because the cluster head node k where the target node i is located, and the cluster ID is unchanged, the new cluster head node l of the target node i receives the starting request message with the sequence number of the initiating node j being not 0 before the initiating node j reaches the maximum number of continuous repetition times, after the target node i is detected in the current cluster, the detection is determined to be not completed, and the cluster head node l will take over the old cluster head node k to forward the message and forward the response to the target node i. If the new cluster head node still can not receive the response of the target node i, a statement that the target node i is in the cluster but can not receive the response is sent to the initiating node j, the initiating node j sends a starting request message with the sequence number 1 to the new cluster head node l, and the time length of a timer is preset to T1So as to eliminate the influence caused by sudden network disconnection of the cluster head k.
In the above embodiment, when the target cluster head node is changed or another abnormal condition occurs, the original target cluster head node or the new target cluster head node sends the target cluster head node change message to the initiating node, and the initiating node sends the node detection message to the new target cluster head node, so that the influence of the abnormal condition of the target cluster head node on the detection result is eliminated.
It will be understood by those skilled in the art that all or part of the steps of implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method of detecting a off-network node, comprising:
the initiating node sends a detection message to the target node through the cluster head node grouped by the mobile self-organizing network so as to search the target node;
the target group head node sends a response message to the initiating node to inform the mobile ad hoc network grouping where the abnormal target node is;
before the initiating node does not receive the feedback message of the target node, the initiating node directly sends the detection message of the target node to the target cluster head node so that the target cluster head node can detect the target node;
if the feedback message of the target node is not received within the preset time, the initiating node determines that the target node is off-line, wherein the preset time is T0+(N-1)T1，T0、T1Indicating the duration of the timer, T0Greater than T1N represents the maximum number of times the originating node sends a detection message;
the target group head node finds the grouping where the target node changes; the target group head node sends a target node grouping change message to the initiating node; the initiating node searches a target cluster head node of the self-organizing network cluster where the target node is located by sending the detection message of the target node to the cluster head node of the self-organizing network cluster again;
if the original target group head node suddenly breaks off the network so that the target group head node is changed into a new target group head node, the new target group head node replaces the original target group head node to detect the target node, the new target group head node sends a response message of the abnormity of the original target group head node to the initiating node, and the initiating node resets the preset time after receiving the response message of the abnormity of the original target group head node sent by the new target group head node.
2. The method of claim 1, wherein the initiating node sending a detection message of a target node to a target cluster head node comprises:
and the initiating node sends the detection message of the target node through the shortest path radial target cluster head node between the initiating node and the target cluster head node.
3. The method of claim 1, wherein the initiating node sending a detection message to a target node through a clusterhead node of a mobile ad hoc network (MANET) cluster comprises:
the initiating node sends the detection message of the target node to the cluster head node of each self-organizing network cluster in a flooding mode;
the cluster head node which receives the detection message of the target node broadcasts the detection message of the target node to the adjacent cluster head node, and simultaneously searches whether the target node exists in the cluster.
4. A system for detecting off-line nodes comprises a plurality of self-organization network clusters, each self-organization network cluster comprises a cluster head node and a member node, wherein,
the initiating node is used for sending a detection message to the target node through the cluster head node grouped by the mobile self-organizing network so as to search the target node; the target node detection device is used for directly sending a detection message of the target node to the target cluster head node before receiving the feedback message of the target node so as to facilitate the target cluster head node to detect the target node; and determining that the target node is offline when the feedback message of the target node is not received within a preset time, wherein the preset time is T0+(N-1)T1，T0、T1Indicating the duration of the timer, T0Greater than T1N represents the maximum number of times the originating node sends a detection message;
the initiating node is a cluster head node or a member node; the target node is a member node;
the target cluster head node is used for responding to the detection message of the target node, and the target cluster head node sends a response message to the initiating node so as to inform the mobile ad hoc network cluster where the abnormal target node is located;
the target group head node is used for discovering the grouping where the target node changes and sending a target node grouping change message to the initiating node; the initiating node is used for searching the target cluster head node of the self-organizing network cluster where the target node is located by sending the detection message of the target node to the cluster head node of the self-organizing network cluster again;
if the original target group head node suddenly breaks off the network so that the target group head node is changed into a new target group head node, the new target group head node replaces the original target group head node to detect the target node, the new target group head node is used for sending a response message of the abnormity of the original target group head node to the initiating node, and the initiating node is used for resetting the preset time after receiving the response message of the abnormity of the original target group head node sent by the new target group head node.
5. The system of claim 4, wherein the originating node is to:
and sending the detection message of the target node to the radial target cluster head node through the shortest path between the radial target cluster head node and the target cluster head node.
6. The system of claim 4,
the initiating node is used for sending a detection message of a target node to a cluster head node of each self-organizing network cluster in a flooding mode;
the cluster head node receiving the detection message of the target node is used for broadcasting the detection message of the target node to the adjacent cluster head node and searching whether the target node exists in the cluster.
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