Method and apparatus for dynamically varying a packet delay in a packet network based on a log-normal delay distribution
US6735192B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1999 |
| Grant date | May 11, 2004 |
| Priority date | — |
| Expiry date | Sep 29, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L65/764
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are disclosed for dynamically adapting the play-out delay for voice packets transmitted over a local area network using the Ethernet standard as an access mechanism. It has been observed that the distribution of voice packet delays in a LAN (shared by voice and data traffic) follows a log-normal distribution. An adaptive algorithm is disclosed to estimate the parameters of the log-normal distribution and to apply a dynamic play-out delay to improve the quality of packetized voice conversations, quantified by minimum delay and packet loss. For example, the size, B, of the play-out buffer can be established to ensure that the packet loss does not exceed one percent (1%). The distribution parameters are continuously updated and the size of the play-out buffer, B, is modified at the beginning of every calibration interval according to the illustrative 99% percentile of the delay distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.