from a transmission signal of a first antenna in a predetermined phase application_number US 74408303 A description reference will now be made in detail to the preferred embodiments of the present invention examples of which are illustrated in the accompanying drawings wherever possible the same reference numbers will be used throughout the drawings to refer to the same or like parts a transmission diversity method in a mobile communication system according to the present invention is explained as follows first of all a data service system 1xev do in a mobile communication system provides a mobile terminal with a packet service using a proportional fair algorithm first of all a priority function pi k for each mobile terminal i and time k is computed pi k dpri k ti k wherein u2018 k u2019 is a time in a slot dpri k is a transmittable data rate from a mobile terminal and ti k is a fairness throughput if the mobile terminal i is not scheduled at the time k u2212 1 ti k w u00b7 ti k if the mobile terminal i is scheduled at the time k u2212 1 ti k w u00b7 ti k u2212 1 1 u2212 w u00b7 ni k u2212 1 wherein w window size u2212 1 slot for reference the fairness throughput is updated each slot and does not directly coincide with a practical throughput and ni k u2212 1 is an information bit number of a packet transmitted through k u2212 1 slot this is updated once at a first slot of a new packet in brief of.