A Cognitive Routing Method Based on Ad Hoc Network Form

Abstract

The invention relates to a cognitive routing method based on Ad Hoc network form. First add the available spectrum information of this node and the next hop node in the routing table, and add the available spectrum information of all nodes in a complete route in the RREQ, RREP and HELLO groups; In the most idle frequency band set, and the idle frequency band whose center frequency is farthest from the primary user’s working frequency is the optimal frequency band to send data information, the present invention uses appropriate idle frequency bands to self-organize and build a network without the need for public control channels, reducing The number of frequency band switching on the link reduces path delay. The route maintenance method provided by the present invention can enable each node in the path to obtain the latest free spectrum information, maintain smooth links, and can be applied to CRAHNs with rapid topological changes; the route maintenance scheme reduces the complexity of the network, Reduced network overhead.

Description

technical field [0001] The invention relates to the design and realization of a cognitive radio Ad Hoc network routing scheme, belonging to the technical field of wireless communication. Background technique [0002] Cognitive radio technology is the most effective means to improve the utilization of wireless spectrum resources. It is a new milestone in the development of wireless communication. Its wide application in the future will surely bring about historic changes in the field of wireless communication. It has been more than ten years since the concept of cognitive radio was put forward. However, the main research in the field of CR is focused on the physical layer and MAC layer, and the research on network layer routing protocols is still in its infancy. Cognitive Radio Ad Hoc Networks (CRAHN), as an important form of network architecture in cognitive networks, has been studied for its self-organization, easy deployment, more flexible networking methods and special ap...

AI Technical Summary

Problems solved by technology

This protocol adopts the rule of sending data on all currently available frequency bands of the node until it finds a channel that can communicate with the next node, without in-depth analysis of spectrum management and selection issues, which will increase network delay and reduce network efficiency

At the same time, the impact of the sudden appearance of the primary user on the communication link of the cognitive network and the frequent switching of channels in the cognitive network are not fully considered.

[0004] From the existing research results, there are obvious defects in the design of the CRAHN routing protocol: 1, the routing protocol based on the common control channel, this assumption cannot be satisfied in the cognitive radio system; 2, when the spectrum dynamic It is a difficult problem whether the routing protocol can survive better under the conditions of frequency change, frequent switching of channels, and constant change of topology; 3. How to organically combine spectrum management with routing selection to reduce the number of frequency switching in the path and reduce network delay , is the need of CRAHN's future development

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