CN103701524A - Self-organizing network based on wireless optical communication - Google Patents

Abstract

The invention provides a self-organizing network based on wireless optical communication. The self-organizing network comprises a plurality of nodes with unique numbers, wherein each node is formed by a plurality of wireless optical transceiver modules arranged like a ring, transceiving units of the wireless optical transceiver modules face the outside of the ring, and each wireless optical transceiver module has an independent unique number. The wireless self-organizing network scheme self-organizing the network through wireless optical communication has the beneficial effects that the system node can be combined with a lighting LED (light emitting diode), and the network nodes can be arranged on telegraph poles, high-tension power wire towers, street lamps or specific supports to form a specialized or universal data transmission shared network.

Description

A self-organizing network based on wireless optical communication

technical field

The invention belongs to the technical field of wireless optical communication, in particular to an ad hoc network based on wireless optical communication.

Background technique

Wireless optical communication is a wireless communication method that uses light intensity to represent signals. It has a series of advantages such as no need for spectrum license, no electromagnetic radiation, low power consumption and high speed. Self-organizing network is a multi-hop temporary autonomous system. It does not need to preset network nodes and pre-design network topology, and does not need to set network parameters such as routing. It only needs to arrange network nodes arbitrarily. It will automatically form a network and build a routing protocol.

Combining wireless optical communication with self-organizing network has unique advantages. Wireless optical communication uses light intensity to carry information. The beam collimation is strong, the power is relatively concentrated, and the communication distance between nodes is easy to expand. At the same time, due to the strong communication alignment, the network topology is relatively simple, and the initialization algorithm is greatly simplified compared with traditional mobile ad hoc networks. In addition, the wireless optical communication system can be safely used in radio frequency shielding and radio frequency sensitive areas. Even, wireless optical communication can be combined with lighting LEDs to set up the self-organizing network on the infrastructure of the lighting network, reducing the cost of setting up.

Contents of the invention

In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide an ad hoc network based on wireless optical communication, which combines wireless optical communication with mobile ad hoc network technology and can be set up on the basis of the existing LED lighting network It provides networking, data transmission, and sharing functions, and can also be used in other scenarios that require wireless communication networks.

In order to achieve the above object, the technical scheme adopted in the present invention is:

An ad hoc network based on wireless optical communication, including several nodes with unique numbers, each node is composed of multiple wireless optical transceiver modules arranged in a ring, the transceiver unit of the wireless optical transceiver module faces outside the ring, each The wireless optical transceiver module has an independent unique number.

The nodes are arranged on the lighting LEDs, and the wireless optical transceiver module is located above the lighting LEDs.

The transmitting end of the wireless optical transceiver module is an infrared LED emitting module, an ultraviolet LED emitting module, a visible light LED emitting module or an infrared or ultraviolet laser emitting module; the receiving end is a photoelectric conversion element.

The photoelectric conversion element is a photodiode, an avalanche diode or a PMT.

When the network is initialized, each node first detects the surrounding nodes that can communicate with itself, and builds a network topology centered on itself, which is represented by a matrix. The element A _ij of the matrix represents the i-th node and the j-th node The channel quality between two nodes, the smaller the number, the better the channel quality; then, each node broadcasts the topology information obtained by itself to the surrounding nodes, and at the same time continuously receives the topology information sent by the surrounding nodes to update and maintain its own network topology Structure matrix, until all nodes have obtained the complete network topology, complete the entire initialization process.

The Unicom mentioned here means that two nodes can communicate with each other.

The basic principle of channel quality of the present invention:

The wireless optical transceiver module is a communication module that can send and receive information like the radio frequency communication module. "Channel quality" is usually carried out by means of "the transmitter sends the training sequence, and the transceiver performs calculation and feedback".

For example, the i-th node broadcasts its own specific training sequence to the surrounding, and the j-th node around receives this training sequence, and can measure the channel quality from node i to node j according to the quality of the received training sequence and try to Give feedback. At the same time, node j will also broadcast its own training sequence. If node i receives the training sequence of node j, it can also measure and calculate the channel quality from node j to node i and try to confirm it. After node i and node j both measure and calculate the channel with each other, it can be considered that node i and node j can communicate with each other, that is, they are connected.

Therefore, by means of each node broadcasting its own training sequence to the surrounding nodes, each node can measure and calculate the nodes around it that can be connected and their channel quality.

In the present invention, each node not only has a wireless optical transceiver module, but also has a signal processing capability. The calculation method of China Unicom has been explained above, the calculation of whether China Unicom is calculated by each node itself. The connectivity type of the entire self-organizing network is represented by a matrix, and each node stores this matrix, and constantly updates and maintains the matrix according to real-time channels and Unicom information.

Compared with the prior art, the present invention comes from the wireless ad hoc network scheme of the organization network through wireless optical communication, and any communication mode in the optical band and any system scheme of the wireless optical communication ad hoc network should all belong to the protection scope of this patent . The system nodes can be combined with lighting LEDs, or the network nodes can be placed on utility poles, high-voltage power towers, street lamps or specific supports to form a dedicated or general data transmission and sharing network.

Description of drawings

Figure 1 is a schematic diagram of a wireless optical communication-self-organizing network node modified by using existing LEDs.

Fig. 2 is a schematic diagram of the network system of the present invention.

Detailed ways

The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

The present invention is an ad hoc network based on wireless optical communication, including several nodes with unique numbers, each node is composed of multiple wireless optical transceiver modules arranged in a ring, the transceiver unit of the wireless optical transceiver module faces outside the ring, Each wireless optical transceiver module has an independent unique number.

In the present invention, each node needs to be specially designed. Since wireless optical communication has strong directionality, multiple (K>=2) wireless optical transceiver modules need to be installed in different directions on the side of the node in order to perform omnidirectional communication.

A retrofit solution based on lighting LED molds is shown in Figure 1. Multiple wireless optical transceiver modules 101 are installed above the existing lighting LEDs 102. This node can use the side wireless optical transceiver modules 101 while providing lighting. Build self-organizing networks.

At the same time, the nodes described in the present invention can also be separated from lighting LEDs. For example, in applications such as utility poles, street lamp stands, and high-voltage towers, the nodes only need two sets of side optical communication transceiver modules, and multiple nodes can form a serial link. A node provides relay services; and if a local area network needs to be temporarily built in field construction operations, military operations, etc., a node with multiple side wireless optical transceiver modules can be used (as shown in Figure 1, but there is no lower lighting LED). This kind of omni-directional communication nodes builds a wireless ad hoc network. At the same time, the wireless optical communication transceiver module does not limit the use of light wave bands, including visible light bands and infrared light bands. Any band can be used. It is only necessary to ensure that the transceiver modules of the entire system use the same band.

During networking, each node in the network needs to pre-allocate an ID, that is, a node number. When setting up the network, arrange the nodes arbitrarily, and execute the system initialization process to complete the analysis of the network topology and the routing and forwarding settings of each node. When the system is initialized, each node first detects the surrounding nodes that can communicate with itself, and builds a network topology centered on itself, which is represented by a matrix. The element A _ij of the matrix represents the i-th node and the j-th node The channel quality between nodes, the smaller the number, the better the channel quality. Furthermore, each node broadcasts the topology information obtained by itself to the surrounding nodes, and at the same time continuously receives the topology information sent by the surrounding nodes, and updates and maintains its own network topology matrix until all nodes obtain a complete network topology and complete the entire initialization. process. After the initialization is completed, all nodes have obtained the network topology described by the matrix. A schematic diagram of a network system is shown in FIG. 2 , which includes six nodes with unique numbers, namely node 1, node 2, node 3, node 4, node 5 and node 6.

During data transmission, for example, a node A needs to transmit data to a node B. Node A obtains a network topology matrix after initialization. Through the analysis of the matrix, node A can calculate whether it is connected to B, and if it is connected, it can calculate the shortest path (the fastest information transmission path). Assuming that A is connected to B, and A has calculated the shortest path, then A packages the route of the shortest path and the data to be sent to the next node of the shortest path. Afterwards, each node continuously forwards the data and finally sends it to B according to the shortest path planning in the data packet, that is, completes a data transmission process.

Claims (6)

1. A self-organizing network based on wireless optical communication is characterized in that it includes several nodes with unique numbers, each node is composed of a plurality of wireless optical transceiver modules arranged in a ring, and the transceiver unit of the wireless optical transceiver module Facing outside the ring, each wireless optical transceiver module has an independent unique number. 2. The ad hoc network based on wireless optical communication according to claim 1, wherein the nodes are arranged on the lighting LED, and the wireless optical transceiver module is located above the lighting LED. 3. The self-organizing network based on wireless optical communication according to claim 1, wherein the transmitting end of the wireless optical transceiver module is an infrared LED transmitting module, an ultraviolet LED transmitting module, a visible light LED transmitting module or an infrared, ultraviolet The laser emitting module; the receiving end is a photoelectric conversion element. 4. The ad hoc network based on wireless optical communication according to claim 3, wherein the photoelectric conversion element is a photodiode, an avalanche diode or a PMT. 5. The self-organizing network based on wireless optical communication according to claim 1, characterized in that, when the network is initialized in the system, each node first detects the surrounding nodes that can communicate with itself, and builds a self-centered network Topological structure, the structure is represented by a matrix, the element A _ij of the matrix represents the channel quality between the i-th node and the j-th node, the smaller the number, the better the channel quality; then, each node will obtain the topology information Broadcast to the surrounding nodes, and at the same time continuously receive the topology information sent by the surrounding nodes, update and maintain its own network topology matrix, until all nodes obtain a complete network topology, and complete the entire initialization process. 6 . The ad hoc network based on wireless optical communication according to claim 5 , wherein the communication means that two nodes can communicate with each other. 7 .

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