Abstract:Aiming at the allocation for Access Point (AP) of Wireless Local
Area Networks (WLAN) based on IEEE 802.11 in ISM band will
inevitably triggers diversified interferences while the authorized
frequency band is under utilization, this paper puts forward a
method which makes AP access primary user's band as a cognitive user
and shares the primary user's channel resources properly under the
premise of guarantee of primary user's Quality of Service (QoS).
Through the modeling for AP based on Signal to Interference Ratio
(SIR), the requirements of AP accessing authorized frequency band
are obtained. It models channel assignment into integer linear
programming which combines the access strategy of authorized
frequency band and proposes a new hybrid band channel allocation
algorithm. Based on a valued graph (weighted graph) of minimal
spanning tree algorithm, this algorithm can fast and accurately
assign a minimum interfered channel in both the authorized frequency
band and ISM band for AP. The simulation results show that the new
algorithm can decrease the average interference of hybrid network
and increase the throughput efficiency of wireless network.