Abstract: A packet scheduler for scheduling transmission over a wireless communications high speed downlink connection of at least one data packet addressed to at least one user equipment. The data packets are stored in a buffer. The packet scheduler includes a processor arranged to determine from the buffer at least one data packet parameter relating to the stored data addressed to each user equipment, and further arranged to determine and vary at least one criteria parameter value. A comparator is configured to compare each data packet parameter against a corresponding at least one criteria parameter value, and further configured to compare each data packet parameter against a corresponding at least one varied criteria parameter value, and a data selector configured to select at least one data packet for scheduling based on the output from the comparator.

Abstract: A method for implementing a stall avoidance mechanism during uplink transmission of data blocks from transmitter to a receiver includes first determining a missing data block in response to a successful receipt of a received data block at the receiver. Once the missing data block is determined, the receiver requests retransmission of the missing data block. The receiver starts a timer when the request for retransmission is made such that the timer has a time value based on the number of reception attempts of the received data block made by the receiver.