This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for spatial stream optimization using dynamic bandwidth. A WiFi scheduler of an access device, such as a customer premises equipment (CPE), may obtain communication parameters about a cellular connection of the access device, such as bandwidth part (BWP) information or start and end markers of downlink data transmissions over the cellular connection. The access device may select a number of spatial streams (NSS) for wireless local area network (WLAN) communications according to the received communication parameters pertaining to the cellular connection, and communicate with one or more stations (STAs) over a WLAN connection using the selected number of spatial streams.