Joint sub-carrier pairing, relay selection and load balancing in two-way relay networks

Relay-based cooperative wireless networks are considered one of the cost-effective solutions to meet the demands in future wireless networks. In this paper, we address the resource allocation problem in multi-user Two-way relaying wireless networks. In order to maximize the cell sum-rate with sub-carrier pairing while ensuring load balancing at relays, we investigate resource allocation algorithms in these networks. A joint optimization problem is formulated under the constraints of sub-carrier pairing, relay selection and load balancing. Hungarian Algorithm based low complexity resource allocation algorithms are proposed. The simulation results show the effectiveness of these algorithms.