Dynamic Channel Assignment in IEEE 802.11g

In this paper, we propose a dynamic channel-assignment algorithm which minimizes the total interferences between access points (APs) of a Wireless Local Area Network (WLAN), while maintaining the Signal to Interferences Ratio (SIR) bigger than a certain threshold for all users. The algorithm initializes the channel assignment at the APs, and calculates the SIR for each user using Integer Linear Programming "ILP" for an open area and for an area with obstacles (walls). The proposed algorithm shows results with significant enhancement of the SIR over WLANs, and therefore an improvement of the throughput. The algorithm can be applied to any WLAN, irrespective of the user distribution and user load.