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Neighbor node finding method based on beam forming antenna

A neighbor node discovery and beamforming technology, applied in wireless communication, access restriction, electrical components, etc., can solve problems such as unfavorable network security and high geographical environment requirements, so as to improve time efficiency, reduce hardware overhead, and ensure reliability Effect

Active Publication Date: 2015-03-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At the same time, some existing neighbor node methods are mainly based on synchronization, require additional hardware such as GPS, have high requirements on the geographical environment, and are not conducive to network security.

Method used

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  • Neighbor node finding method based on beam forming antenna
  • Neighbor node finding method based on beam forming antenna
  • Neighbor node finding method based on beam forming antenna

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The communication method of the present invention specifically includes the following steps:

[0039] In the first step, the network range and the total number of nodes within this range are imported into the node.

[0040] In the second step, all nodes enter the omnidirectional discovery stage. According to the data in the first step, the node density is calculated, and then the average number of neighbor nodes for each node is calculated. Let the interval between nodes sending Training sequence obey the exponential distribution with parameter λ, and the node is in receiving mode when it is not sending Training sequence. Calculate the optimal λ of the system according to the average number of neighbor nodes. The optimal λ can be expressed as:

[0041] λ op = 1 2 kτ

[0042] Among them, k represents the average number of neighbor nodes, and τ represe...

Embodiment 2

[0054] In the first step, the area is 3.14×10 8 m 2 In the circular area of ​​, deploy 2000 nodes, import the area area and the total number of nodes into the nodes, and the sending distance of the nodes is 1000m.

[0055] In the second step, according to the first step, the average number of neighbor nodes of the node is 19. Let the node send the Training sequence interval to obey the parameter λ op The exponential distribution of , where Receive mode at other times

[0056] In the third step, the node updates and maintains the neighbor node direction information table, and the direction discovered for the first time is recorded in it. If the direction of the Training sequence has been recorded before, it will not be recorded repeatedly.

[0057] In the fourth step, according to the actual needs, the threshold value of the neighbor node discovery ratio is set to 0.998. The time for all nodes to stay in the omnidirectional discovery phase is:

[0058] t a =-38e log0.00...

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Abstract

The invention relates to a neighbor node finding method based on a beam forming antenna. The method comprises the following steps that (1) a network range and the total number of nodes within the range are input; (2) the optimum distribution of intervals formed when an omnibearing finding stage sends Training sequences is calculated; (3) a receiving node maintains a neighbor node direction information table according to the Training sequences; (4) when the neighbor node direction finding proportion exceeds a threshold value, an orientation finding stage is started; (5) an independent transmitting and receiving mode is selected before a period starts; (6) the node runs a slow-scanning Hello information mechanism; (7) the node receiving Hello information maintains a neighbor node to-be-relied information table, a rapid reply mechanism is made to run, the node in the receiving mode is selected to enter a rely information receiving stage. Compared with the prior art, on the basis of the asynchronous time slot, the reliability of the neighbor nodes is ensured through two handshakes, and the neighbor nodes can be rapidly and effectively found.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a neighbor node discovery method based on a beamforming antenna. Background technique [0002] Wireless multi-hop ad-hoc network (MANET) can realize mutual communication between nodes without using the existing network infrastructure, and has a wide range of applications in military communications, sensor networks, and disaster relief. The wireless multi-hop self-organizing network designed with traditional omnidirectional antennas has many conflicts and low throughput. With the development of antenna technology, beamforming technology has brought advantages in transmission distance, anti-interference performance, space division multiplexing, and network performance. However, to fully utilize these advantages of beamforming antennas, a fast and accurate neighbor node discovery method is required. [0003] Neighbor node discovery method aims to establish c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W8/00H04W48/16
CPCH04W8/00H04W40/24H04W48/16
Inventor 孙大佳李悦丁良辉杨峰钱良
Owner SHANGHAI JIAO TONG UNIV
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