We investigate the optimum uplink traffic scheduling algorithm in an hybrid 3G/WLAN network with Relaying Mobile Terminals (RMTs). The proposed scheduling algorithm consists of two levels: (1) we use a proportional scheduling algorithm to coordinate the transmission among RMTs, where the main objectives are to achieve high spectrum efficiency and reasonable fairness; (2) within RMT, packets from different leaf nodes are further scheduled via a link-adaptive CDMA transmission scheme. We demonstrate that power/code allocation inside of the RMT scheduler can effectively re-assign slack power among packets according to their BER requirements, which allows some BER-stringent packets to be transmitted at a higher data rate. The simulation results are promising, showing a 28% or higher increase in overall throughput for different traffic patterns.