Optimization of Load Balancing in Hybrid LiFi/RF Networks

Yunlu Wang, Dushyantha A. Basnayaka, Xiping Wu, Harald Haas

Research output: Contribution to journalArticlepeer-review


Light fidelity (LiFi) uses light emitting diodes (LEDs) for high-speed wireless communications. Since an LED lamp covers a small area, a LiFi system with multiple access points (APs) can offer a significantly high spatial throughput. However, the spatial distribution of data rates achieved by LiFi fluctuates because users experience inter-cell interference from neighboring LiFi APs. In order to guarantee a quality of service (QoS) for all users in the network, an RF network is considered as an additional wireless networking layer. This hybrid LiFi/RF network enables users with low levels of optical signals to achieve the desired QoS by migrating to the RF network. With regard to moving users, the hybrid LiFi/RF system dynamically allocates either a LiFi AP or an RF AP to users based on their channel state information. In this paper, a dynamic load balancing scheme is proposed, which considers the handover overhead in order to improve the overall system throughput. Joint optimization algorithm (JOA) and separate optimization algorithm (SOA), which jointly and separately optimize the AP assignment and resource allocation, respectively, are proposed. Simulation results show that SOA can offer a better performance/complexity tradeoff than JOA for system load balancing.

Original languageEnglish
Article number7820066
Pages (from-to)1708-1720
Number of pages13
JournalIEEE Transactions on Communications
Issue number4
Early online date17 Jan 2017
Publication statusPublished - 14 Apr 2017


  • dynamic load balancing
  • handover overhead
  • LiFi
  • outage
  • RF


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