Cross-Layer Joint Rate Control and Scheduling for OFDMA Wireless Mesh Networks
The authors consider the utility maximization problem in the downlink of Wireless Mesh Networks (WMN) with Orthogonal Frequency Division Multiple Access (OFDMA). They formulate this problem as a cross-layer design of joint rate control and OFDMA scheduling in order to utilize the scarce radio resources efficiently. The problem is decoupled into a rate control problem, at the transport layer, and a channel-aware and queue-aware scheduling problem, at the MAC/PHY layer. The rate control problem adjusts arrival rates to the Base Station (BS) queues, and the scheduling problem, determines link rates, i.e., departure rates from the BS and other network nodes, through subcarrier and modulation rate assignment.