Indoor communication system has known an exponentially growth due to high demand of wireless data service ratio. As an alternative way, the visible light zone of the electromagnetic spectrum is explored to fulfil the future wireless data traffic requirements. Among the main issues that can be handled in the visible light communication (VLC) system are the resources allocation and interferences management. In this paper, we aim to enhance the throughput of the edge user based on the joint optimization of the power and bandwidth in the VLC downlink indoor cellular network. We propose a new geometry design that alleviates the inter-cell interference (ICI) of the edge users which occurs especially in the overlapping areas between the adjacent cells. An orthogonal frequency division multiple access (OFDMA) based on the direct current optical (DCO) is regarded as the channel access protocol for supporting the multiusers at the same time. At the edge of the coverage area, we evaluate the performance of the proposed method in terms of the achievable throughput and signal-to-interference-plus-noise ratio (SINR).Furthermore, based on the least square (LS), the joint optimization of the power and bandwidth result to a parameter ρ 0 which varies between 0 and 1. The results show that the new optimization with ρ 0 =0.9 depict better improvements in term of throughput R(ρ 0) D,δ =65Mbps at r 3,1 =3m.We further notice that the signal-noise-ratio (SNR) is increased with ρ 0 =0.9 at the expense of the error probability falling (P z ≅ 10 −4).