Guaranteed Delay for Voice Traffic in an Integrated Packet-Switched Network
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Packet-switched transmission of voice traffic can result in variable network delays for different packets belonging to the same speaker. This can lead to discontinuities in the output speech if the packets are delivered to the destination as they arrive. Consequently, additional buffering of voice packets is done at the destination in order to smooth out the variation in delay. Specifically, a target playout time is chosen for each packet, and packets not arriving within this time are discarded. The target playout time can be chosen based on the network delay distribution such that the constraints on the delay and packet loss are met. This requires that the destination keep track of network conditions and adapt to the changes from time to time.