With the increasing of physical-layer (PHY) data<\/p>\n\n\n\n
rate in modern wireless local area networks (WLANs) (e.g.,<\/p>\n\n\n\n
802.11n), the overhead of media access control (MAC) progressively<\/p>\n\n\n\n
degrades data throughput ef<\/span>fi<\/span>ciency. This trend re<\/span>fl<\/span>ects a<\/span><\/p>\n\n\n\n fundamental aspect of the current MAC protocol, which allocates<\/p>\n\n\n\n the channel as a single resource at a time. This paper argues<\/p>\n\n\n\n that, in a high data rate WLAN, the channel should be divided<\/p>\n\n\n\n into separate subchannels whose width is commensurate with<\/p>\n\n\n\n the PHY data rate and typical frame size. Multiple stations can<\/p>\n\n\n\n then contend for and use subchannels simultaneously according<\/p>\n\n\n\n to their traf<\/span>fi<\/span>c demands, thereby increasing overall ef<\/span>fi<\/span>ciency. We<\/span><\/p>\n\n\n\n introduce FICA, a <\/span>fi<\/span>ne-grained channel access method that embodies<\/span><\/p>\n\n\n\n this approach to media access using two novel techniques.<\/p>\n\n\n\n First, it proposes a new PHY architecture based on orthogonal<\/p>\n\n\n\n frequency division multiplexing (OFDM) that retains orthogonality<\/p>\n\n\n\n among subchannels while relying solely on the coordination<\/p>\n\n\n\n mechanisms in existing WLAN, carrier sensing and broadcasting.<\/p>\n\n\n\n Second, FICA employs a frequency-domain contention method<\/p>\n\n\n\n that uses physical-layer Request to Send\/Clear to Send (RTS\/CTS)<\/p>\n\n\n\n signaling and frequency domain backoff to ef<\/span>fi<\/span>ciently coordinate<\/span><\/p>\n\n\n\n subchannel access. We have implemented FICA, both MAC and<\/p>\n\n\n\n PHY layers, using a software radio platform, and our experiments<\/p>\n\n\n\n demonstrate the feasibility of the FICA design. Furthermore,<\/p>\n\n\n\n our simulation results show FICA can improve the ef<\/span>fi<\/span>ciency of<\/span><\/p>\n\n\n\n WLANs from a few percent to 600% compared to existing 802.11.<\/p>\n\n\n\n \u00a0<\/p>\n","protected":false},"excerpt":{"rendered":" With the increasing of physical-layer (PHY) data rate in modern wireless local area networks (WLANs) (e.g., 802.11n), the overhead of media access control (MAC) progressively degrades data throughput efficiency. This trend reflects a fundamental aspect of the current MAC protocol, which allocates the channel as a single resource at a time. This paper argues that, 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