Browse Prior Art Database

Priority Transmission of First Voice Packet

IP.com Disclosure Number: IPCOM000101552D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 1 page(s) / 31K

Publishing Venue

IBM

Related People

Ma, JS: AUTHOR

Abstract

Disclosed is a technique of reducing delay when voice is transmitted over a real-time packet switched network (1) under a blind playout (2).

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This is the abbreviated version, containing approximately 100% of the total text.

Priority Transmission of First Voice Packet

       Disclosed is a technique of reducing delay when voice is
transmitted over a real-time packet switched network (1) under a
blind playout (2).

      The sender transmits the first packet of every talk spurt (3)
with a priority higher than that of the following packets.  In
general, a higher priority means a lower delay.

      The receiver applies to the first packet the playout delay
equivalent to the bounded delay of the low priority. Also packets
arriving with talk spurt sequence number violation are discarded.

      The receiver regards a received packet as the first packet of a
talk spurt if the talk spurt sequence number has been incremented.
Since two priorities are used, it is possible for the first packet of
a talk spurt to arrive earlier than some trailing packets in the
previous talk spurt.  If that happens, then the talk spurt sequence
number will be out of order, and the receiver discards the trailing
packets in the previous talk spurt.

      References
(1)  I. Cidon, I. Gopal and H. Meleis, "PARIS: An Approach to Private
Integrated Networks," Proc of ICC'87 (June 1987).
(2)  W. A. Montgomery, "Techniques for Packet Voice Synchronization,"
IEEE JSAC (December 1983).
(3)  J. Ma and I. Gopal, "A Blind Voice Packet Synchronization
Strategy,"  IBM Research Report RC 13893 IBM T. J. Watson Research
Center, Yorktown Heights, NY 10598 (July 1988).