Patent ID: 7633880

Claim:
A queue management method of an access network device storing a received packet in a transmission queue and transmitting the stored packet to a destination node in a storage order, the method comprising: determining whether the packet is transmittable within a delivery deadline allowed for real-time traffic to the destination node by the access network device; and dropping the packet instead of storing the packet in the transmission queue when determined that the packet is not transmittable within the delivery deadline by the access network device, wherein the determining of whether the packet is transmittable comprises: calculating a maximum allowable queue length of the access network device for the transmission within the delivery deadline; comparing the maximum allowable queue length with a current queue length of the transmission queue; and determining the packet transmission infeasibility within the delivery deadline if the current queue length is greater than or equal to the maximum queue length, and wherein the maximum allowable queue length is calculated by waiting a predetermined period of time before the retransmission.