Energy-Efficient Federated Edge Learning in Multi-Tier NOMA-Enabled HetNet

Mohammad Arif Hossain, Nirwan Ansari

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We propose a novel multi-Tier (top, intermediate, and bottom tiers) architecture at the edge of a heterogeneous network (HetNet) where non-orthogonal multiple access (NOMA) provides access to user equipment (UE) to participate in federated edge learning (FEL). The HetNet consists of a macro base station (MBS) and several small base stations (SBSs) where each BS is equipped with an edge server (ES). SBSs use the same system bandwidth to increase the system capacity. The top tier consists of the MBS-ES which works as the global model aggregator while ESs of SBSs and UEs connected with MBS reside in the intermediate tier. Similarly, UEs connected with an SBS-ES of the intermediate tier occupy the bottom tier. ESs of SBSs work as the intermediate model aggregators between the ES of the top tier and the UEs of the bottom tier. To minimize the total energy consumption (EC) for local computing (LC) and uplink transmission (UT) of UEs, we formulate a non-linear programming (NLP) optimization problem, present our solution by decomposing the problem into sub-problems, and propose two sequential algorithms to estimate EC for both LC and UT with less complexity. Our extensively simulated results demonstrate the viability of our proposed work.

Original languageEnglish (US)
Pages (from-to)3355-3366
Number of pages12
JournalIEEE Transactions on Cloud Computing
Issue number4
StatePublished - Oct 1 2023

All Science Journal Classification (ASJC) codes

  • Software
  • Information Systems
  • Hardware and Architecture
  • Computer Networks and Communications
  • Computer Science Applications


  • Distributed learning
  • edge computing
  • energy minimization
  • federated learning
  • heterogeneous network
  • multi-Tier computing
  • non-orthogonal multiple access


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