Methods and apparatus are provided for a many to one communication protocol. In one novel aspect, a modified CTS is sent by a receiving wireless communications station in response to a regular RTS. The modified CTS includes an indication for an uplink MU operation. In one embodiment, a modified CTS indicates a restricted access window (RAW) followed by RAW parameter set (RPS). In one embodiment, a subset of wireless communications devices associated with the receiving wireless communications station sends modified PS-poll with uplink data indication. Such PS-poll traffic is protected from passerby wireless communications devices from an OBSS. The receiving wireless communications station sends a modified resource-allocation map frame followed by a regular CTS frame. The subsets of wireless communications devices send their uplink data based on the received resource allocation map. The RTS-originating wireless station either sends its data frame earlier or concurrently with other wireless communications devices.