The invention relates to a method of allocating resources in the uplink of a wireless communication network supporting real-time packet data services by utilizing a centralized resource allocation module and a plurality of radio terminals. The method includes generating data blocks at the radio terminals and transmitting them as frames to the resource allocation module. The frames include an indication of the number of data blocks stored in a data queue of the radio terminal and the number of data blocks being generated by the data block source. The resource allocation module allocates resources to each radio terminal based on the indication transmitted by each radio terminal.