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In most of the indoor factory monitoring system sensor relocations and reorganizations are necessary with reorganization of production lines and/or starting of new production lines. These relocations and/or additions sometime make congestion in some area of the network and difficult to achieve online expansion. As a result, in the dynamic changing environment the online expansion is a challenging problem for the indoor factory sensor network. A two-tier autonomous decentralized architecture has been proposed for the environment. The first layer consists of sensors and the second layer consists of routers. In the architecture routers make community (a group of nodes mutually cooperate for a common goal is a community) that shares information to achieve a specific goal. A resource deficit router makes a community which we call as request based community to utilize some resources of resource available routers. To utilize the resources the community members share information. After sharing information a resource deficit router switches load to resource available router by connecting and disconnecting sensors. The goal of this paper is to introduce the request based community construction technology in wireless sensor network that shares information by the routers of the community to achieve high expandability. We show the effectiveness of our proposed technology using simulation.