Method, apparatus, base station and network system for selecting dynamic frequency

Abstract

The present invention provides a method of dynamic frequency selection, including acquiring candidate channel information, then determining and balancing a candidate channel level of the selected probability of each candidate channel according to the acquired candidate channel information; updating candidate channel selection probability according to determined candidate channel level; selecting a channel according to the updated candidate channel selection probability. The invention also provides a dynamic frequency selection device, base station and network system. By balancing the selected probability of each available candidate channel, the invention reduces the access collision rate of the adjacent cognitive system in a certain candidate channel, thereby reducing the maximum time relay of the network system, improving the throughput of the network system.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a dynamic frequency selection technology. Background technique [0002] Cognitive Radio (CR, Cognitive Radio) is a solution to the contradiction that frequency band resources are becoming more and more scarce, while licensed frequency band utilization is not high. The key technology of cognitive radio is to flexibly and efficiently use the "spectrum hole" adaptively according to the actual occupied situation of the spectrum, that is, the frequency band that is not used by all licensed systems in the network system; or without interfering with the licensed system, Make full use of free frequency bands. That is to say, the system using the cognitive radio technology, that is, the cognitive system, needs to work simultaneously with the licensed system and other cognitive systems in the network system where it is located under limited frequency band resources. [0003] figur...

AI Technical Summary

Problems solved by technology

[0024] From the flow of the dynamic frequency selection method described above, it can be seen that when a cognitive system selects a channel, it randomly selects from the available channels saved or set in advance by itself, so that multiple adjacent cognitive systems will compete for the same channel. channel, that is, collisions occur, resulting in an excessively high access collision rate in a certain channel, and multiple access failures in the system, resulting in unfair access

[0025] At the same time, when an access collision occurs, the cognitive system determines whether it can access the selected next-hop channel according to the time of the DFS announcement. Therefore, if the collision continues to occur, it may cause a delay when the cognitive system transmits data. is infinite, which seriously affects the throughput of the entire network system

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