Measurement-Based Spectrum Database for Flexible Spectrum Management

Koya SATO  Masayuki KITAMURA  Kei INAGE  Takeo FUJII  

Publication
IEICE TRANSACTIONS on Communications   Vol.E98-B   No.10   pp.2004-2013
Publication Date: 2015/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.2004
Type of Manuscript: Special Section PAPER (Special Section on 5G Radio Access Networks―Part II: Multi-RAT Heterogeneous Networks and Smart Radio Technologies)
Category: 
Keyword: 
dynamic spectrum access,  cognitive radio,  spectrum database,  TVWS,  

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Summary: 
In this paper, we propose the novel concept of a spectrum database for improving the efficiency of spectrum utilization. In the current design of TV white space spectrum databases, a propagation model is utilized to determine the spectrum availability. However, this propagation model has poor accuracy for radio environment estimation because it requires a large interference margin for the PU coverage area to ensure protection of primary users (PUs); thus, it decreases the spectrum sharing efficiency. The proposed spectrum database consists of radio environment measurement results from sensors on mobile terminals such as vehicles and smart phones. In the proposed database, actual measurements of radio signals are used to estimate radio information regarding PUs. Because the sensors on mobile terminals can gather a large amount of data, accurate propagation information can be obtained, including information regarding propagation loss and shadowing. In this paper, we first introduce the architecture of the proposed spectrum database. Then, we present experimental results for the database construction using actual TV broadcast signals. Additionally, from the evaluation results, we discuss the extent to which the proposed database can mitigate the excess interference margin.