Apparatus and method of controlled delay packet forwarding

一种设备、延迟值的技术，应用在时分多路复用系统、数字传输系统、数据交换网络等方向，能够解决复杂、难以过滤等问题

Active Publication Date: 2009-09-30
JUMIPER NETWORKS INC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Furthermore, statistics of such accumulated jitter can be very dependent on highly self-similar traffic patterns and thus can be very complex and difficult to filter

Method used

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  • Apparatus and method of controlled delay packet forwarding
  • Apparatus and method of controlled delay packet forwarding
  • Apparatus and method of controlled delay packet forwarding

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Embodiment Construction

[0023] Controlled delay packet forwarding eliminates most or all of the jitter of each transfer hop by exchanging the delay increased by each hop with the jitter decreased by each hop. Controlled delay packet forwarding works by applying a controlled delay large enough to the controlled delay packet so that the controlled delay packet does not experience the maximum jitter source at each transfer hop, such as MA jitter 212 or NQ jitter 218. This ensures that the delay and jitter of forwarding controlled-delay packets are predictable for each transfer hop. Controlled delay packet forwarding is particularly useful for timing packets, such as NTP packets distributed from a time server. Such NTP packets have strict jitter accumulation requirements and may undergo many hops. By using controlled delay packet forwarding, NTP unicast, anycast, multicast, and broadcast packets can be forwarded with almost constant delay through each transfer hop, and have a small and statistically better p...

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Abstract

The present invention discloses an apparatus and method for forwarding of packets with controlled delay. In one embodiment, the invention includes controlled delay queuing logic to hold a packet in a first class for a queuing time of at least a controlled delay value, and scheduling logic to determine whether to delay transmission of a packet in a second class to allow the transmission of the packet in the first class when the queuing time reaches the controlled delay value.

Description

[0001] Cross references to related applications [0002] This application claims priority for U.S. Provisional Patent Application No. 60 / 839,465 filed on August 22, 2006, the entire content of which is incorporated herein by reference. Technical field [0003] The invention mainly relates to the processing of packet traffic in a computer network. More specifically, the present invention relates to forwarding packets with a controlled delay at each network device in order to minimize the accumulation of jitter. Background technique [0004] In recent years, the demand for the delivery of real-time applications and services in computer networks has grown rapidly, including pseudo-wire emulation (PWE), voice over Internet protocol (VoIP), video conferencing, broadcast, multicast, and optional streaming services ( streaming service), such as H.261, H.323 and IPTV. These real-time services may require highly accurate timing to ensure high service quality. For example, it is hoped to el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/16H04L47/22H04L47/32H04L47/56
CPCH04L47/283H04L12/5693H04L47/10H04L47/564H04L47/50
Inventor 查尔斯·F·巴里沈天风·F·潘米纳克什·S·萨布拉玛尼恩汉克·P·古延
Owner JUMIPER NETWORKS INC
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