Multi-Objective Optimization of WLAN Associations With Improved Handover Costs

作者：Zola Enrica^*; Barcelo Arroyo Francisco; Kassler Andreas

来源：IEEE Communications Letters, 2014, 18(11): 2007-2010.

DOI：10.1109/LCOMM.2014.2359456

• Handover cost function
• mixed integer optimization problem
• multi-objective optimization
• IEEE 802.11

The deployment of a large number of access points in public areas presents a new paradigm in which a given station may be served by more than one access point at a time. Recently, a network model has been proposed to derive the optimal association strategy for the stations by solving a linear optimization problem. According to that model, a station cannot download data while performing a handover. In this letter, we demonstrate that, even in static conditions (i.e., no mobility and constant load in the cell), an association strategy can force a handover. We thus propose a multi-objective optimization function that maximizes the download rates and minimizes the number of handovers. As a handover implies an extra cost due to necessary signaling to be exchanged, we propose a new handover cost function that takes into account the extra bandwidth. Using the new strategy, the system throughput slightly decreases, and the number of handovers is reduced.

• 出版日期2014-11