A Distributed Topological Method for Constructing k-Channel Connectivity in Cognitive Adhoc Networks

Abstract

The invention discloses a distributed topology method for constructing K channel connectivity in a cognitive Ad Hoc network, which mainly solves the problems of splitting of secondary user networks and mutual interference of secondary users in the prior art when multiple primary users occupy channels. The implementation process is as follows: 1. Each node in the network broadcasts the HELLO packet twice successively, and receives the HELLO packet from the initial neighbor node, and establishes a local two-hop topology subgraph; 2. Constructs the shortest path based on the local two-hop topology subgraph tree, and according to the shortest path tree, build a local generated subgraph that can guarantee the connectivity of the secondary user; 3. Adjust the transmission power and determine the logical neighbors of each node according to the one-hop neighbor nodes in the local generated subgraph; 4. From the network All the nodes and the links between the nodes and their logical neighbors form the whole network topology, and channel selection is performed. The invention can ensure the connection of the secondary user network, eliminate the interference of the secondary user, save channel resources, and can be used for cognitive Ad Hoc network.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a method based on constructing a K-channel connected network topology structure, which can be used for cognitive Ad Hoc networks. Background technique [0002] Network topology is a very important factor affecting the performance of cognitive Ad Hoc networks. Improving the robustness of cognitive Ad Hoc networks and enhancing the fault tolerance of network topology have become the key research directions of topology control technology. There are two kinds of users in the cognitive AdHoc network, one is the primary user and the other is the secondary user. The main user has the priority to use the channel. When the primary user occupies the channel, the secondary user must back off the channel in a silent state, which may affect the connectivity of the secondary user. When multiple primary users occupy multiple channels, there will be a large number of secondary users givin...

AI Technical Summary

Problems solved by technology

When the primary user occupies the channel, the secondary user must back off the channel in a silent state, which may affect the connectivity of the secondary user

When multiple primary users occupy multiple channels, there will be a large number of secondary users giving up the right to use the channel, which may make the situation of network segmentation more serious. Therefore, how to maintain authentication when multiple primary users occupy channel resources? Knowing that the connectivity of the Ad Hoc network has become a key issue

In the article "Bi-Channel-Connected Topology Control in Cognitive Radio Networks" published by Xinjun Wang and other authors on IEEE VTC 2014, the algorithm can ensure the connectivity of the secondary user network and eliminate the interference between secondary users, but the The method is only valid for a single primary user. When multiple primary users appear, it cannot guarantee the connectivity of the network, nor can it eliminate the interference of secondary users, thus affecting the fault tolerance of the cognitive Ad Hoc network.

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