Spatial Reuse DCF for Enhancing Throughput and Performance Analysis

In this paper, we propose a new MAC protocol to effectively exploit spatial reuse of IEEE 802.11 distributed coordination function (DCF). The existing DCF node simply blocks its transmission if the medium is sensed to be busy. Thus, it is inefficient in terms of the network throughput due to overcautious estimation of the interference. The proposed spatial reuse DCF (SRDCF) employs the information of locations and the required signal to interference ratio (SIR) to predict the interference more accurately. Then, it determines whether the node blocks its data transmission or not. Based on the interference estimation (i.e., feasibility analysis), we extract the appropriate transmission power for successful concurrent transmissions. By doing this, the node of the SRDCF can adjust its transmission power. Consequently, the SRDCF increases the network throughput by allowing concurrent transmissions. Theoretical analysis and simulation results show that the proposed SRDCF works better than original IEEE 802.11 DCF.