| 摘要 |
It is described a procedure for the scheduling of transmission permits of radio blocks of the RLC/MAC protocol specified for the new GPRS service of packet data transmission in GSM systems. The procedure foresees the establishment of as many priority queues of transmission permits as are the GPRS time-slots, to be used for the scheduling of control and signalling blocks, and of a same number of non-priority queues of permits for the scheduling of RLC blocks of data queued in the buffers of TBF. At each scheduling step, the priority queues of permits are filled starting from the requests sent on FIFO basis by the TBF MANAGER. When a request for a TBFi connection is received, an identifier TFIi, and a possible RRBP value are written in the permit queue resulting more unloaded among those assigned to the mobile, and so on, up to exhausting the requests. In the same scheduling step, non-priority queues are filled randomly selecting a TBFi queue, and a time-slot j among those allocated to the TBFi connection for which the more unloaded permit queue is allocated, and entering the maximum possible number of TFIi identifiers, in the form of permits, in subsequent free positions of the selected queue. The granting of permits to different TBFi queues being repeated in the current step, where possible (Figure 25a). <IMAGE> |
