Differentiated MAI Control for Hybrid ARQ-II in CDMA Networks

Multiple access interference (MAI) is a bottleneck to limit the capacity of CDMA system. Differential MAI control is proposed for hybrid ARQ-II of CDMA networks by noticing that successive trials of transmission have increasing error-correcting capability in hybrid ARQ-II. 

Data packets are classified and put into corresponding queues according to different trials of transmission. Scheduling algorithm is studied and applied to realize such control. Simulation shows that differential MAI control using Weighted Round Robin (WRR) or Deficit Weighted Round Robin (DWRR) scheduling has significant improvement by comparison to simple MAI control for hybrid ARQ-II in CDMA networks.