Space-time joint access method for multi-hop cognitive wireless networks

Abstract

The invention relates to a space-time joint accessing method of a multi-hop cognitive radio network. When a radio network determines a multi-hop transmitting route, a cognitive user judges whether a free opportunity or a sharing opportunity exists or not via space domain perception and time domain perception, and then determines a frequency spectrum accessing mode and transmission power according to the free opportunity or the sharing opportunity. According to method provided by the invention, through joint consideration of the space domain opportunity and time domain opportunity of the frequency spectrum, the transmission power of the cognitive user is optimized while the main user is fully protected, and continuous accessing of the multi-hop cognitive radio network to authorized spectrum bands is achieved, so that the problems of severe power constraint and discontinuous data transmission of the conventional frequency spectrum accessing method are solved, and the requirements of the cognitive radio network on continuity and timeliness are met.

Description

technical field [0001] The invention relates to a spectrum access technology of a cognitive wireless network, in particular to a space-time joint access method of a multi-hop cognitive wireless network. Background technique [0002] With the rapid development and large-scale application of wireless network technology, the problem of unreasonable allocation and scarcity of radio spectrum resources has become increasingly prominent. Reports from government organizations such as FCC in the United States, OFCOM in the United Kingdom, MIC in Japan, CEPT in Europe, and iDA in Singapore show that a large number of authorized radio frequency spectrums are in a state of extremely low utilization. The proposal and rapid development of cognitive radio technology provide new ideas and solutions to solve the shortage of spectrum resources and improve the performance of wireless networks. Therefore, cognitive wireless networks based on this technology are considered to be the most importa...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that the existing spectrum access method only considers the time-domain or air-space opportunity and the spectrum utilization rate is low, the present invention proposes a space-time joint access method for a multi-hop cognitive wireless network. Domain sensing explores the space and time domain opportunities of the spectrum, and then selects different power control strategies according to the results of space-time joint sensing, and then realizes continuous access and data transmission of licensed frequency bands by CUs cognitive users, and improves spectrum efficiency. Satisfy the continuity and real-time requirements of cognitive wireless networks while maintaining high utilization

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