Abstract: Wireless mesh networks (WMNs) have gained considerable interest in expanding IEEE 802.11 networks to large-scale enterprise and community scenarios, primarily because of its capability of providing wide-band network access to a significant number of users. However, the mesh nodes are typically limited in resources such as bandwidth, computation power and memory. Capacity limitation is one of the fundamental issues in wireless networks. Excess capacity(EC) is the unused capacity. Here in this paper EC Management techniques are used to improve network performance. In this approach a proactive provisioning algorithm is used which is checking in advance whether network capacity is full or not, whether new more connections can be established or not and is freeing up the excess capacity in advance. This approach reduces the End-to-End delay, packet lost ratio and improves the other network performance metrics like packet delivery ratio, throughput and capacity utilization. These process is performed by reserving capacity and freeing up the excess capacity respectively in advance.