METHOD FOR TRANSMITTING UPLINK DATA IN A COMMUNICATIONS SYSTEM

摘要

The invention relates to a method for transmitting an uplink data signal (7), in particular comprising ranging data (R), from a mobile station (MS3) to a base station (BS) of a communication cell of a wireless communications system, in particular of a WiMAX system, the method comprising: synchronizing the transmission of the uplink data signal (7) with the transmission of a downlink sub-frame (4a) transmitted from the base station (BS) to the mobile station (MS3) by using a common signal (8), in particular a common trigger signal, of a global positioning system which is received by both the base station (BS) and the mobile station (MS1 to MS3). The method may further include: in the mobile station (MS1 to MS3), determining a propagation delay (RTD / 2) between the common trigger signa! (8) and the start of the reception of the downlink sub-frame (4a), and calculating a delay correction value (RTD) for delaying the transmission of the uplink data signal (7) based on the determined propagation delay (RTD / 2), The invention also relates to a computer program product for implementing the method, to a communications eel!, to a communications system, and to a TDD frame structure (4).