A system includes a base station configured to communicate with a plurality of mobile stations. The base station transmits downlink timing synchronization and establishes frequency synchronization with at least one of the plurality of mobile stations. The base station receives, from the mobile station, at least one of: coarse sounding reference signal (SRS), and fine SRS. The base processes at least one of the coarse SRS to enable tracking of the preferred uplink (UL) slice for uplink transmissions, and the fine SRS in order to resolve a short-term small-scale channel state information (CSI), estimate a CSI from at least one of the coarse SRS and fine SRS, and perform uplink scheduling and grant. The mobile station performs uplink scheduling request and uplink data communication.