コグニティブ無線の実現に向けて: 周波数有効利用と信頼性の向上

摘要

Cognitive radio is a dynamic air interface technology which utilizes the limited amount of radio spectrum resource and accommodates more various types of traffic without increasing the required system bandwidth. In this paper, after the introduction of cognitive radio, including the background, definition, main projects, etc, one approach in the context of the heterogeneous cognitive radio access networks which adequately find the underutilized radio resource among multiple radio interfaces, is highlighted: public-private cooperative cognitive radio access networks, which consist of "public cellular and/or hot spot networks", and "private WiFi community networks, like FON", and realize reliable Internet access services with less time and cost of service area expansion. We conclude cognitive radio under the current trends.%コグニティプ無線は，場所的時間的に空いている周波数を活用し，新たに周波数獲得を獲得することなくモバイルトラフィックの増大に対応する技術として注目されている．本稿では，コグニティプ無線の実現に向けた動向を概観するとともに，周波数有効利用と信頼性の向上を目指した研究開発として，FONのような共同利用型の自営アクセスネットワークと公衆アクセスネットワークを連携させる公衆自営連携アクセスネットワークを紹介し，今後の無線のあり方を展望する．