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Multichannel based reactive routing method in cognitive radio system

A multi-channel, reactive technology, applied in the field of communication, can solve the problems that the performance of multi-channel wireless networks cannot be guaranteed, and the diversity of available channels is not considered, so as to improve throughput and reduce conflicts.

Inactive Publication Date: 2010-03-17
NANJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

Since the existing routing protocols in the Ad Hoc network are basically based on the shortest distance routing, routing can be effectively selected in the single-channel network, but because the diversity of available channels in the network is not considered, such protocols cannot be used in multi-channel wireless networks. performance cannot be guaranteed

Method used

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  • Multichannel based reactive routing method in cognitive radio system

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Embodiment Construction

[0029] Based on the purpose of minimizing channel switching in routing, OLCH-AODV (On-Least Channel Handoff-AODV) is mainly aimed at reactive routing protocols.

[0030] The principle of traditional routing protocols to select routes is the shortest route. Since the goal of OLCH-AODV algorithm is to reduce the channel switching delay in routing, they first consider the number of channel switching. Consider the shortest route. The transmission delay on a path can be calculated as follows:

[0031] T delay =d×t hop +s×t sd

[0032] Among them, d and s respectively represent the number of hops of the route and the number of channel switching times, t hop Indicates the transmission delay of each hop, t sd Indicates the time required for channel switching. Therefore, in order to reduce the delay, the number of channel switching times should be considered first when selecting a route, and try to choose a route that requires fewer switching times.

[0033] Assuming that there...

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Abstract

The invention discloses a multichannel based reactive routing method in a cognitive radio system and relates to an implementation method particularly used for a cognitive user to find routing in a self-organizing network based on a cognitive radio technology. The method is realized as follows: during establishing routing, nodes on one routing try best to select the same channel for avoiding confliction, available-channel information of the nodes is recorded in routing grouping, and the nodes receive the grouping select channels according to the information and gather and add available channelsmaintained by self into the grouping. The method aims to reduce channel switching during routing, carries out available-channel information of the nodes during finding routing aiming to a demand routing protocol, and distributes channels for each leap in routing through decision nodes. The routing method combines routing selection and channel distribution, reduces the occurrence of infliction, greatly enhances the throughput of a system, is simple and practical, and can be wieldy applied to multi-channel minitype distributed cognitive networks.

Description

technical field [0001] The invention relates to an implementation scheme for a cognitive user to find a route in an ad hoc network based on cognitive radio technology, and belongs to the technical field of communication. Background technique [0002] Due to the rapid growth of wireless communication service demands, available spectrum resources are becoming increasingly scarce, and how to jointly and effectively utilize those idle spectrums has become a research hotspot of many scholars. At the end of 2003, the FCC (the Federal Communications Commission) issued a policy formulation proposal on cognitive radio technology and its applications, pointing out that the utilization rate of the currently allocated frequency bands ranges from 15% to 85%, and certain frequency bands such as mobile phone networks The frequency band is overloaded, but the utilization rate of the spectrum in some low-frequency bands with better signal propagation characteristics, such as the TV band, is ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W40/28H04W84/18
Inventor 朱琦谢晋
Owner NANJING UNIV OF POSTS & TELECOMM
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