H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 7/08 (2006.01) H04J 3/06 (2006.01) H04N 7/24 (2006.01) H04N 7/62 (2006.01) H04Q 11/04 (2006.01) H04L 12/56 (2006.01)
Patent
CA 2181900
A method preserving an original timestamp value in a packet (70) of data to be transmitted from a transmission site to a reception site wherein the original timestamp value may require adjustment at the reception site to account for delays experienced by that packet (70) during multiplexing and/or transmission. The method comprises the steps of (a) defining at least first (88) and second (96) fields within the packet (70), (b) inserting, at the transmission site, an original timestamp value in the first field (88) of the packet (70), and thereafter not modifying the value in the first field (88); and (c) adding the value of any multiplexing or transmission delays experienced by that packet (70) to an initial value in the second field (96). At the reception site, the second field (96) will reflect any delays experienced by the packet (70) while the original timestamp value is preserved in the first field (88).
L'invention concerne un procédé pour conserver l'horodatage d'origine dans un paquet (70) de données transmises d'un point de transmission vers un point de réception, où l'horodatage d'origine peut nécessiter un ajustement au point de réception pour tenir compte des retards subis par ce paquet (70) durant le multiplexage et/ou la transmission. Le procédé consiste à: (a) définir au moins un premier champ (88) et un second champ (96) dans le paquet (70); (b) à insérer, au point de transmission, une valeur d'horodatage d'origine dans le premier champ (88) du paquet (70) et à ne plus modifier ensuite la valeur dans le premier champ (88); et (c) à ajouter la valeur de tout retard de multiplexage ou de transport subi par ce paquet (70) à une valeur initiale dans la second champ (96). Au point de réception, le second champ (96) va inclure tout retard subi par le paquet (70), pendant que la valeur de l'horodatage d'origine est conservée dans le premier champ.
Logston Gary L.
Wasilewski Anthony J.
Gowling Lafleur Henderson Llp
Scientific-Atlanta Inc.
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