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The emerging IEEE 802.11s standard draft is a key technology of next-generation wireless networks. It can provide end users with broadband access of fast deployment, low cost, large coverage, and robust architecture. Recently, IEEE 802.11s draft has defined hybrid routing as default routing protocol. When tree-based topology is enabled, different mesh points (MPs) and mesh access points (MAPs) will achieve different loads according to their hops to the root, while previous discussions assumed that all the stations in the network have the same load. In this paper, we proposed an analytical model for IEEE 802.11 networks which considers different loads in hybrid routing. In the model, MPs/MAPs are classified into different groups according to their hops from the root and those closer to the root have a heavier load. We calculate their packet arrival rates in reasonable assumptions and derive the throughput and end-to-end delay. At last, numerical results show the factors, such as hops, affect network performance.