6LoWPAN gateway provides an interface for small size devices to establish IP connection with other Internet devices. One of the standard that 6LoWPAN conforms to is IEEE 802.15.4 which is used for low processing and low power devices. This standard uses frequency spectrum of 2.4 GHz ISM band that overlaps with other standards such as WiFi, Bluetooth and even WiMAX. This causes potential congestion and collision that leads to possible degradation in service quality. The main interference in 6LoWPAN is from WLAN devices. In this paper, we study the deployment of channel allocation by considering the effects of the performance based on interference of deployed environment, size of payload and distance length between sensor node and gateway. These performance tests are executed in the presence and absence of overlapping channel in the environment.