CN113747473A - Ad-hoc network method and ad-hoc network system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
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- 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
Abstract
The invention relates to an ad hoc network method and an ad hoc network system, wherein the ad hoc network method comprises the following steps: providing nodes which can be connected with each other and at least can be built into a tree-shaped network with an upper structure and a lower structure; and constructing an intermediate network between the same level or the cross level of the tree network formed by the nodes so as to connect two nodes of the same level or two nodes of the cross level in the tree network.
Description
Technical Field
The invention relates to the technical field of ad hoc networks, in particular to an ad hoc network method and an ad hoc network system.
Background
The blue private networking technology released by Pairlink can support one-to-many and many-to-many transmission communication capability of Bluetooth nodes, and the networking (Mesh) technology is more suitable for Internet of things solutions requiring tens of thousands of devices to transmit and transmit information in safe, reliable and stable environments, such as building automation, wireless sensor networks and the like.
In the current networking technology, as the number of networking devices increases, and the networking area increases, a longer routing path is brought because the original architecture is a tree-shaped architecture, and finally, the delay of data transmission increases.
Moreover, after the group control wireless signal is sent from the sending end (switch, remote controller, mobile phone APP, etc.), because there are various uncertain delays in the transmission in the system, for example, retransmission is caused by different link qualities, for example, waiting caused by data accumulation, for example, the number of times of forwarding is different, and finally the time required for the signal to reach the controlled terminal is different, an asynchronous problem is brought, for example, the lamp in the whole room is lighted, when the time difference of receiving the signal between the lamps exceeds the reaction capability of human eyes, the problem of successive lighting visible to the naked eye is caused, which results in worse user experience.
It is desirable to provide a technique for shortening the communication path between nodes of a network and reducing the time difference between the received signals of the nodes, so as to optimize the user experience.
Disclosure of Invention
It is an object of the present invention to provide an ad hoc networking method and an ad hoc networking system to overcome the above problems.
In order to solve the above technical problem, the following provides an ad hoc network method, including the following steps:
providing nodes which can be connected with each other and at least can be built into a tree-shaped network with an upper structure and a lower structure;
and constructing an intermediate network between the same level or the cross level of the tree network formed by the nodes so as to connect two nodes of the same level or two nodes of the cross level in the tree network.
Optionally, the tree network includes a root node, an intermediate node, and leaf nodes, where the intermediate node is disposed between the root node and the leaf nodes, and the root node and the intermediate node, and the intermediate node and the leaf nodes can communicate with each other.
Optionally, when an intermediate network is constructed between peers or spans of the tree network formed by the nodes, the method at least includes:
forming an intermediate network between a root node and an arbitrary leaf node in the tree network, or
Forming an intermediate network between an intermediate node in the tree network and leaf nodes of other intermediate nodes, or
Forming an intermediate network between any two intermediate nodes of said tree network, or
An intermediate network is formed between any two leaf nodes of the tree network.
Optionally, before an intermediate network is constructed between peers or spans of the tree network formed by the nodes, the method further includes the following steps:
constructing a signal area;
and establishing an intermediate network for nodes in the tree network in the signal area according to a preset rule.
Optionally, the nodes are connected to each other, and after the nodes can form the tree network, a network timestamp is configured for the nodes in the signal area.
Optionally, after configuring a network timestamp for a node in the signal area, the method further includes the following steps:
each node broadcasts its own network time stamp to other nodes;
each node receives network time stamps broadcast and sent by other nodes;
each node detects whether the received network time stamp contains a first network time stamp, and the first network time stamp is earlier than the network time stamp of the node;
and if so, controlling the network time stamp of the node to be synchronous with the first network time stamp.
Optionally, when data interaction is performed between the two nodes, the sent data includes a network timestamp of the data itself.
Optionally, after receiving the data, the node further includes the following steps:
comparing the network time stamp of the node with the network time stamp in the received data;
if the network time stamp in the data is earlier than the network time stamp of the node, delaying the response of the data according to the time difference between the network time stamp in the received data and the network time stamp of the node;
and if the network timestamp in the data is behind the network timestamp of the node, responding to the data.
The following also provides an ad hoc network system, comprising:
the node can realize the method of the ad hoc network and at least comprises a Bluetooth node;
and the beacon base is used for forming a signal area and networking nodes in the signal area.
The ad-hoc network method and the ad-hoc network system in the application form the intermediate network between the same levels or cross levels of the tree network, so that the communication distance between the levels of the tree network can be greatly shortened, and the communication speed is accelerated. In addition, as the network timestamps of all the nodes are uniformly operated and are uniformly unified into the most advanced network timestamp, the probability of time difference when each node responds to the same control command is reduced, and the use experience of people in communication by using the network can be optimized.
Drawings
Fig. 1 is a schematic flow chart illustrating steps of a method for ad hoc network according to an embodiment.
Fig. 2 is a schematic structural diagram of a tree network in the prior art.
Fig. 3 is a schematic structural diagram of a tree network after an intermediate network is added in the present application.
Detailed Description
The ad hoc network method and the ad hoc network system according to the present invention will be described in detail with reference to the accompanying drawings and the following detailed description.
Referring to fig. 1 to 3, fig. 1 is a schematic diagram illustrating a flow of steps of a method for ad hoc network according to an embodiment, and fig. 2 is a schematic diagram illustrating a structure of a tree network in the prior art. Fig. 3 is a schematic structural diagram of a tree network after an intermediate network is added in the present application.
In this particular embodiment, a method of ad hoc networking is provided, comprising the steps of:
step S101: providing nodes which can be connected with each other and at least can be built into a tree-shaped network with an upper structure and a lower structure;
referring to fig. 2, in the embodiment shown in fig. 2, when the nodes form a tree network in a node networking manner, only one path is available from data of one node to another node, which may result in a greatly prolonged data transmission path from node to node. For example, to transmit data from node a to node B in the ad hoc network shown in fig. 2, there must be 5 times of forwarding through point C to reach point B.
Step S102: and constructing an intermediate network between the same level or the cross level of the tree network formed by the nodes so as to connect two nodes of the same level or two nodes of the cross level in the tree network.
Referring to fig. 3, in the embodiment shown in fig. 3, the network structure formed by node networking may be developed from a tree structure to a mesh structure, and multiple paths may be selected from data of one node to another node, and an optimal path may be calculated through an algorithm.
In this embodiment, data is transmitted from the a node to the B node of the ad hoc network shown in fig. 3, and the data may pass through the D point and reach the B point after 3 times of forwarding.
According to the method for the ad hoc network, when the number of networking equipment is increased and the networking area is increased, a longer routing path is brought because the original architecture is a tree-shaped architecture, and finally, the delay of data transmission is increased.
The ad hoc network method in this embodiment can transversely develop links based on the original network, and select the best shortcut through an algorithm, so that the tree structure is developed into a mesh structure, the forwarding times of data can be effectively shortened, and the method is compatible with the tree network. This means that existing iterations of products based on this networking technique can be seamlessly joined.
In this embodiment, in addition to being able to connect and build a tree network, each node may also turn on a beacon function, which means that a device using the ad hoc network method described in this embodiment may turn on the beacon function without adding any hardware, for example, applications based on beacon (beacon) technology, such as indoor positioning, APP application wakeup, electronic fence, advertisement push, and the like, may be implemented.
In the embodiments shown in fig. 2 and 3, the nodes in the ad hoc network may be acquired by the controller 103, and thus controlled by the controller 103. And the controller comprises an intelligent terminal such as a smart phone and the like, a remote controller and the like. The node can also broadcast signals outward, and the broadcast signals can be acquired by external sensors 104. In the embodiment shown in fig. 2 and 3, the controller 103 is shown as a square block and the sensor 104 is shown as a triangular block. The sensor 104 may receive data broadcast by the node.
The tree network comprises a root node 100, an intermediate node 101 and leaf nodes 102, wherein the intermediate node 101 is arranged between the root node 100 and the leaf nodes 102, and communication can be carried out between the root node 100 and the intermediate node 101 and between the intermediate node 101 and the leaf nodes 102.
When an intermediate network is constructed between peers or spans of the tree network formed by the nodes, the method at least comprises the following steps: an intermediate network is formed between the root node 100 and any leaf node 102 in the tree network, so that the root node 100 in the tree network can directly communicate with the leaf node 102, and the communication distance is shortened without the intermediate node 101 arranged in the middle.
When an intermediate network is constructed between peers or spans of the tree network formed by the nodes, the method at least comprises the following steps: an intermediate network is formed between the intermediate node 101 and the leaf nodes 102 of other intermediate nodes 101 in the tree network, so that the intermediate nodes 101 in the tree network can directly communicate with the leaf nodes 102 of another intermediate node 101 without the help of the root node 100 and another intermediate node 101, and the communication distance is shortened.
When an intermediate network is constructed between peers or spans of the tree network formed by the nodes, the method at least comprises the following steps: an intermediate network is formed between any two intermediate nodes 101 of the tree network, so that the intermediate nodes 101 at the same level in the tree network can directly communicate with another intermediate node 101, and the communication distance is shortened without the help of a root node 100.
When an intermediate network is constructed between peers or spans of the tree network formed by the nodes, the method at least comprises the following steps: an intermediate network is formed between any two leaf nodes 102 in the tree network, so that the leaf nodes 102 at the same level in the tree network can directly communicate with another leaf node 102, and the communication distance is shortened without the aid of the intermediate node 101 and the root node 100.
In this embodiment, before an intermediate network is constructed between peers or spans of a tree network formed by the nodes, the method further includes the following steps: constructing a signal area; and establishing an intermediate network for nodes in the tree network in the signal area according to a preset rule. Only nodes within the range of the same signal area can build up a network.
In this embodiment, the signal area is established by a beacon base, a routing table is stored in the beacon base, when an intermediate network needs to be set, addresses of two nodes that need to set the intermediate network are updated to the routing table, and a communication path between a node a and a node B at the same level or across levels in the tree network is recorded in the routing table.
The message sent by the beacon base or the message sent by the nodes in the signal area constructed by the beacon base can directly complete communication among nodes at the same level or across levels in the tree network based on the updated routing table, thereby shortening the communication distance. In one embodiment, the nodes share the routing table in the network, and when a message is sent through a node in the network, the shortest path can be calculated according to the routing table.
And after the nodes are connected with each other and form the tree network, configuring a network time stamp for the nodes in the signal area.
Specifically, after the network node starts working, a low-frequency independent synchronous broadcast signal is started, the broadcast signal carries a network ID and a synchronous network timestamp, and the network timestamp carried in each broadcast signal is real-time.
Because all the in-network devices independently time the synchronous network timestamp, and a certain precision error exists in a dependent clock, and an error is generated after long-time timing, the method also comprises the following steps after the network timestamp is configured for the nodes in the signal area: each node broadcasts its own network time stamp to other nodes; each node receives network time stamps broadcast and sent by other nodes; each node detects whether the received network time stamp contains a first network time stamp, and the first network time stamp is earlier than the network time stamp of the node; and if so, controlling the network time stamp of the node to be synchronous with the first network time stamp.
The mechanism can quickly synchronize the network time stamp in the whole network after being powered on, and the final result is that each device has a very close network time stamp which can be controlled within 50 milliseconds.
Due to the function of synchronizing the network time stamps, the signal sending end can directly synchronize the network time stamps with the connected equipment after the signal sending end is connected to the network, then independently time, and keep timing to synchronize the network time stamps in the connection process.
In this embodiment, when data interaction is performed between two nodes, the transmitted data includes its own network timestamp.
After the node receives the data, the method also comprises the following steps: comparing the network time stamp of the node with the network time stamp in the received data; if the network time stamp in the data is earlier than the network time stamp of the node, delaying the response of the data according to the time difference between the network time stamp in the received data and the network time stamp of the node; and if the network timestamp in the data is behind the network timestamp of the node, responding to the data.
When each node in the network receives the same signal, the response time difference of each node can be greatly reduced, when each node is applied to a light environment, each light source is configured with the node and is controlled to be lightened by the group control signal received by the node, at the moment, the response lightening time difference of each node can be controlled in a range invisible to naked eyes, so that even if the group control signal reaches the nodes assembled on each light source at the same time, the nodes assembled on each light source can synchronously respond to the group control signal, each light source is controlled to be lightened synchronously, and the use experience of a user is optimized.
The following also provides an ad hoc network system, comprising: the node can realize the ad hoc network method in the embodiment and at least comprises a Bluetooth node; and the beacon base is used for forming a signal area and networking nodes in the signal area.
The Bluetooth nodes at least comprise Bluetooth nodes conforming to Bluetooth core4.2 and above specifications.
The ad-hoc network method and the ad-hoc network system in the application form the intermediate network between the same levels or cross levels of the tree network, so that the communication distance between the levels of the tree network can be greatly shortened, and the communication speed is accelerated. In addition, the network timestamps of all the nodes are uniformly operated and are uniformly unified into the most advanced network timestamp, so that the probability of time difference when all the nodes respond to the same control command is reduced.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A method of ad-hoc networking, characterized by: the method comprises the following steps:
providing nodes which can be connected with each other and at least can be built into a tree-shaped network with an upper structure and a lower structure;
and constructing an intermediate network between the same level or the cross level of the tree network formed by the nodes so as to connect two nodes of the same level or two nodes of the cross level in the tree network.
2. An ad-hoc networking method according to claim 1, wherein: the tree network comprises a root node, intermediate nodes and leaf nodes, wherein the intermediate nodes are arranged between the root node and the leaf nodes, and the root node and the intermediate nodes and the leaf nodes can communicate with each other.
3. An ad-hoc networking method according to claim 2, wherein: when an intermediate network is constructed between peers or spans of the tree network formed by the nodes, the method at least comprises the following steps:
forming an intermediate network between a root node and an arbitrary leaf node in the tree network, or
Forming an intermediate network between an intermediate node in the tree network and leaf nodes of other intermediate nodes, or
Forming an intermediate network between any two intermediate nodes of said tree network, or
An intermediate network is formed between any two leaf nodes of the tree network.
4. An ad-hoc networking method according to claim 1, wherein: before an intermediate network is constructed between the same level or the cross level of the tree network formed by the nodes, the method also comprises the following steps:
constructing a signal area;
and establishing an intermediate network for nodes in the tree network in the signal area according to a preset rule.
5. An ad-hoc networking method according to any one of claims 4, wherein: and after the nodes are connected with each other and form the tree network, configuring a network time stamp for the nodes in the signal area.
6. An ad-hoc networking method according to any one of claims 5, wherein: after configuring the network time stamp for the nodes in the signal area, the method further comprises the following steps:
each node broadcasts its own network time stamp to other nodes;
each node receives network time stamps broadcast and sent by other nodes;
each node detects whether the received network time stamp contains a first network time stamp, and the first network time stamp is earlier than the network time stamp of the node;
and if so, controlling the network time stamp of the node to be synchronous with the first network time stamp.
7. An ad-hoc networking method according to claim 6, wherein: when data interaction is carried out between the two nodes, the sent data comprises the network time stamp of the data.
8. An ad-hoc networking method according to claim 7, wherein: after the node receives the data, the method also comprises the following steps:
comparing the network time stamp of the node with the network time stamp in the received data;
if the network time stamp in the data is earlier than the network time stamp of the node, delaying the response of the data according to the time difference between the network time stamp in the received data and the network time stamp of the node;
and if the network timestamp in the data is behind the network timestamp of the node, responding to the data.
9. An ad-hoc network system, wherein the method of enabling the ad-hoc network of any one of claims 1 to 8, comprises:
the nodes at least comprise Bluetooth nodes;
and the beacon base is used for forming a signal area and networking nodes in the signal area.
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| CN202111020643.9A CN113747473A (en) | 2021-09-01 | 2021-09-01 | Ad-hoc network method and ad-hoc network system |
| PCT/CN2022/107845 WO2023029815A1 (en) | 2021-09-01 | 2022-07-26 | Ad hoc network method and ad hoc network system |
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