Fair Partitioning of the Downlink Resources of an OFDMA-Based Multi-User Multi-Tier Cellular Network Using Fractional Frequency Reuse. - Akindele Segun Afolabi; Erdenebileg Munkhbat; Yumi Takaki; Chikara Ohta; Hisashi Tamaki; Yoshizo Tanaka; Takashi Yamamoto; Yoji Okada (IEICE Trans. Commun., 2012)