Beam Configuration and Client Association for Access Points with Switched Beam Antennas

Ching-Ju Lin, Tung Wei Kuo, Pei Jiun Yan, Wan Jie Cheng, Shyh Kang Jeng

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Unlike conventional omnidirectional antennas, switched beam antennas exploit antenna arrays and signal processing techniques to focus energy in a specific beam-width and orientation. Recent research has shown that access points of a WLAN can exploit such switched beam antennas to increase the overall network capacity. The achievable sum rate of a WLAN with switch beam antennas is however mainly determined by how each AP selects its beam, including the orientation and width, and how each client associates with a proper AP. The goal of this paper is to solve the Joint Beam configuration and Client association (JBC) problem such that the sum rate of all clients in the network can be maximized. We formulate the JBC problem as a mixed integer linear programming model, and propose a 2-approximation algorithm to solve it. Our proposed algorithm has two distinctive properties: 1) it can be realized as a distributed protocol that allows the APs to configure their beams without the help of a central coordinator, and 2) it can be generally applied both in specific scenarios, where exact client locations are known, and in uncertain scenarios, where only geographic client distribution is given. Finally, we adjust the sum-rate maximization algorithm to the throughput maximization algorithm, which further takes medium sharing among clients into account. The simulation results show that the proposed algorithm outperforms both WLANs using omnidirectional antennas and other heuristics using switched beam antennas.

Original languageEnglish
Article number7300443
Pages (from-to)2179-2192
Number of pages14
JournalIEEE Transactions on Mobile Computing
Issue number9
StatePublished - Sep 2016


  • beam orientation and width configuration
  • client-AP association
  • Switched beam antennas

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