  This paper proposes a simple but accurate approximation to analytically model
both the inter-WLANs (Wireless Local Area Networks) interactions and the
negative effect of collisions in networks of IEEE 802.11 WLANs. Inter-WLANs
interactions are characterized using a continuous time Markov chain (CTMC)
model where states represent the set of active WLANs at a given time. Then, the
effect of collisions is considered by analyzing the local dynamics between
contending WLANs at every state using the well-known IEEE 802.11 Bianchi model.
Results confirm the accuracy of the presented approach.
