コグニティブメッシュネットワークにおけるMAC層技術

摘要

電波資源の効率的利用を目指し，コグニティプ無線の研究が進められている．電波資源を通信リンク単位で考える複数無線利用のコグニティプ無線システムは，特に周波数資源枯渇が深刻な都市部において複数無線の負荷分散を実現する．都市部での利用以外にも，相互干渉か大きな問題となるメッシュネットワークにおいてはコグニティプ無線の有する高度な干渉低減機能が有効である．このような利点を有するコグニティブ無線のMAC層技術に関して言及する．ノード間の無線選択をネットワーク層から行う際に利用する無線環境情報の効率的な交換手法に関しても議論を行い，パネルに供する．%[Panel Discussion] Cognitive Radio system is regarded as the great candidate to improve the effective usage of the radio resource. Especially, the cognitive radio system with the multi-transmission links approach has advantage of backward compatibility to existing radio systems. In the city center, the several wireless access services are provided to the same area; this multi-transmission links approach works to level the loads of them. On the other hand, with their intelligent suppression of radio interference, the cognitive radio links resolves the problem of mutual interference between the nodes of mesh networks. In this paper, we introduce the MAC sub-layer system for the cognitive radio system with the multi-transmission links. The effective and scalable method to exchange the radio environment information in order to select the collect wireless media between the nodes is presented and discussed as the network layer technology.