Table 1: Previous algorithms: main features.

Algorithm Reference Two-tier Multihop Centralized/distributed Round-robin subsetting Subsampling Adaptive scheduling CAG [19] × √ Distributed × √ × GUPTA [18] × √ Semidistributed × × × KEN [24] × √ Distributed × √ × SeReNe [29] × √ Centralized × × × RRC [25] √ × Centralized √ × × SS-MH/SS-2T Proposed Method √ √ Centralized √ √ √