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The authors propose an efficient control channel resource allocation approach to enhance the performance of Voice-over-IP (VoIP) in Orthogonal Frequency Division Multiple Access- (OFDMA-) based next generation mobile communication systems. As the Long-Term Evolution (LTE) of Universal Terrestrial Radio Access Network (UTRAN), Evolved UTRAN (E-UTRAN) is the first OFDMA-based packet radio network and thus selected in this paper as an application example. Their proposed physical downlink control channel (PDCCH) resource allocation approach for E-UTRAN is composed of bidirectional power control, Inner Loop Link Adaptation (ILLA), and Outer Loop Link Adaptation (OLLA) algorithms.
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