In order to increase the throughput and fully use wider bandwidth, the IEEE 802.11ax task group introduces ULMUMIMO. However, the ULMUMIMO is not specifically addressed, due to the complexity of user scheduling. Recently, heterogeneous networks have been widely discussed, and the research on CRAN provides the flexibility to the offloading between LTE and WLAN. In this paper, we propose a coscheduling model for UL MUMIMO based on the heterogeneous network scenario. Simulation results show that the proposed approach significantly improves the capacity and average throughput of the UL MUMIMO in WLAN networks.