Time Alignment Using RTCP Feedback
draft-taylor-avt-time-align-00
| Document | Type |
Expired Internet-Draft
(individual)
Expired & archived
|
|
|---|---|---|---|
| Author | Tom Taylor | ||
| Last updated | 2006-06-16 | ||
| RFC stream | (None) | ||
| Intended RFC status | (None) | ||
| Formats | |||
| Stream | Stream state | (No stream defined) | |
| Consensus boilerplate | Unknown | ||
| RFC Editor Note | (None) | ||
| IESG | IESG state | Expired | |
| Telechat date | (None) | ||
| Responsible AD | (None) | ||
| Send notices to | (None) |
This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:
Abstract
This memo describes the use of RTCP-based feedback to reduce end-to- end delay through the use of time alignment between the source and receiver. Time alignment is useful, for example, in certain gateway-to-gateway scenarios and certain gateway-to-VoIP-terminal scenarios. It is the ability for a receiver to request that the sender shift the time reference for packetization by a specified amount. When a receiver with strict packet timing limitations, e.g., due to a 3G UMTS Iu interface, is connected to an sender at a peer endpoint capable of responding to time alignment requests, e.g., with an AMR encoder associated with a PCM interface to the PSTN, this allows the endpoints to reduce delay in the speech path by as much as the 20 ms frame-block duration, depending on the degree of misalignment in the time reference.
Authors
(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)