A mechanism to resolve congestion by adapting the MIMO transmission mode in the MANET environment

Hayoung Oh, Sanghyun Ahn

Research output: Contribution to journalArticlepeer-review


The MIMO antenna system has two optional transmission modes, MUX and DIV. The MUX mode increases data rate and the DIV mode enhances reliability or transmission range. In order to provide connectivity in a MANET, a MTMO-aware routing mechanism, MIR, was proposed. In MIR, when nodes are close to each other, the MUX mode is used and the DIV mode is used only for disconnected links. Therefore, if a node receives packets from its previous-hop nodes through the MUX mode and transmits packets in the DIV mode, the node may suffer from congestion. To resolve this type of congestion, we propose a mechanism that allows a congested node to adaptively control the MIMO transmission mode of its previous-hop nodes. For the determination of when to request for the MIMO transmission mode change, four levels of queue thresholds are defined. Based on the queue size, the congestion resolution or the throughput recovery operation is performed. We show the performance of our proposed mechanism by carrying out Qualnet-based simulations. The simulation results prove that our mechanism handles congestion situation appropriately.

Original languageEnglish
Pages (from-to)5387-5396
Number of pages10
Issue number11A
StatePublished - 1 Nov 2014


  • MIMO
  • Queue threshold
  • Routing
  • Spatial diversity mode
  • Spatial multiplexing mode


Dive into the research topics of 'A mechanism to resolve congestion by adapting the MIMO transmission mode in the MANET environment'. Together they form a unique fingerprint.

Cite this