Cross-layer approach for asymmetric traffic accommodation in full-duplex wireless network

Recent advances in transceiver design demonstrated efficient self-interference (SI) cancellation and full-duplex communication in a single band. The main challenge in the design and deployment of an efficient full-duplex communication is to address the problem of asymmetric data flow in a network with symmetric link capacity. A system with symmetric radio resource allocation, i.e. full-duplex, would under utilize the radio resources when downlink and uplink traffic is asymmetric. Apparently, this is because uplink or downlink may not have traffic to send on the allocated resources which results in under utilization of radio resource. In this paper, we propose a cross-layer model to accommodate asymmetric traffic in full-duplex networks. The proposed model considers the power and rate allocation for the downlink and uplink users based on the observation of the signal-to-interference-plus-noise ratio (SINR) from the physical layer and uplink traffic buffer. Full-duplex transmission characteristics are exploited for maximizing the downlink data rate for asymmetric traffic. Simulation results prove that the proposed model not only accommodate the asymmetric traffic but also improves the overall system throughput while maintaining the quality of service (QoS).