Device, system, and method of coordinating among multiple collocated wireless communication units. For example, a wireless communication device may include a first wireless communication unit to communicate with an access point of a first wireless communication network; and a second wireless communication unit to communicate in a second wireless communication network, wherein the first wireless communication unit is to determine at least one contention-free period, during which the second wireless communication unit is expected not to communicate in the second wireless communication network, and wherein, during the contention-free period, the first wireless communication unit is to transmit to the access point at least one request to transmit one or more pending transmissions to the first wireless communication unit. Other embodiments are described and claimed.