draft-ietf-avt-rtp-gsm-hr-01.txt   draft-ietf-avt-rtp-gsm-hr-02.txt 
Network Working Group X. Duan Network Working Group X. Duan
Internet-Draft S. Wang Internet-Draft S. Wang
Intended status: Standards Track China Mobile Communications Intended status: Standards Track China Mobile Communications
Expires: March 27, 2010 Corporation Expires: April 3, 2010 Corporation
M. Westerlund M. Westerlund
K. Hellwig K. Hellwig
I. Johansson I. Johansson
Ericsson AB Ericsson AB
Sept 23, 2009 Sept 30, 2009
RTP Payload format for GSM-HR RTP Payload format for GSM-HR
draft-ietf-avt-rtp-gsm-hr-01 draft-ietf-avt-rtp-gsm-hr-02
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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Drafts. Drafts.
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This Internet-Draft will expire on March 27, 2010. This Internet-Draft will expire on April 3, 2010.
Copyright Notice Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the Copyright (c) 2009 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents in effect on the date of Provisions Relating to IETF Documents in effect on the date of
publication of this document (http://trustee.ietf.org/license-info). publication of this document (http://trustee.ietf.org/license-info).
Please review these documents carefully, as they describe your rights Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. and restrictions with respect to this document.
Abstract Abstract
This document specifies the RTP payload format for packetization of This document specifies the payload format for packetization of the
the encoded output of the GSM Half-Rate speech codec . GSM Half-Rate speech codec data into the Real-time Transport Protocol
(RTP). The payload format supports transmission of multiple frames
Requirements Language per payload and packet loss robustness methods using redundancy.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. GSM Half Rate . . . . . . . . . . . . . . . . . . . . . . . . 3 3. GSM Half Rate . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Payload format Capabilities . . . . . . . . . . . . . . . . . 4 4. Payload format Capabilities . . . . . . . . . . . . . . . . . 4
4.1. Use of Forward Error Correction (FEC) . . . . . . . . . . 4 4.1. Use of Forward Error Correction (FEC) . . . . . . . . . . 4
5. Payload format . . . . . . . . . . . . . . . . . . . . . . . . 5 5. Payload format . . . . . . . . . . . . . . . . . . . . . . . . 5
5.1. RTP Header Usage . . . . . . . . . . . . . . . . . . . . . 6 5.1. RTP Header Usage . . . . . . . . . . . . . . . . . . . . . 6
5.2. Payload Structure . . . . . . . . . . . . . . . . . . . . 6 5.2. Payload Structure . . . . . . . . . . . . . . . . . . . . 6
5.2.1. Encoding of Speech Frames . . . . . . . . . . . . . . 7 5.2.1. Encoding of Speech Frames . . . . . . . . . . . . . . 8
5.2.2. Encoding of Silence Description Frames . . . . . . . . 8 5.2.2. Encoding of Silence Description Frames . . . . . . . . 8
5.3. Implementation Considerations . . . . . . . . . . . . . . 8 5.3. Implementation Considerations . . . . . . . . . . . . . . 8
5.3.1. Transmission of SID frames . . . . . . . . . . . . . . 8 5.3.1. Transmission of SID frames . . . . . . . . . . . . . . 8
5.3.2. Receiving Redundant Frames . . . . . . . . . . . . . . 8 5.3.2. Receiving Redundant Frames . . . . . . . . . . . . . . 8
5.3.3. Decoding Validation . . . . . . . . . . . . . . . . . 8 5.3.3. Decoding Validation . . . . . . . . . . . . . . . . . 8
6. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1. 3 frames . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.1. 3 frames . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.2. 3 Frames with lost frame in the middle . . . . . . . . . . 10 6.2. 3 Frames with lost frame in the middle . . . . . . . . . . 10
7. Payload Format Parameters . . . . . . . . . . . . . . . . . . 10 7. Payload Format Parameters . . . . . . . . . . . . . . . . . . 10
7.1. Media Type Definition . . . . . . . . . . . . . . . . . . 11 7.1. Media Type Definition . . . . . . . . . . . . . . . . . . 11
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payload format specified in this document has a media type name that payload format specified in this document has a media type name that
is different from (audio/gsm-hr). is different from (audio/gsm-hr).
2. Conventions 2. Conventions
This document uses the normal IETF bit-order representation. Bit This document uses the normal IETF bit-order representation. Bit
fields in figures are read left to right and then down. The left fields in figures are read left to right and then down. The left
most bit in each field is the most significant. The numbering starts most bit in each field is the most significant. The numbering starts
from 0 and ascends, where bit 0 will be the most significant. from 0 and ascends, where bit 0 will be the most significant.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
3. GSM Half Rate 3. GSM Half Rate
The Global System for Mobile Communication (GSM) network provides The Global System for Mobile Communication (GSM) network provides
with mobile communication services for nearly 3 billion users (status with mobile communication services for nearly 3 billion users (status
2008). The GSM Half Rate Codec (GSM-HR) is one of the speech codecs 2008). The GSM Half Rate Codec (GSM-HR) is one of the speech codecs
that are used in GSM networks. GSM-HR denotes the Half-Rate speech that are used in GSM networks. GSM-HR denotes the Half-Rate speech
codec as specified in [TS46.002]. codec as specified in [TS46.002].
Note: for historical reasons these 46-series specifications are Note: for historical reasons these 46-series specifications are
internally referenced as 06-series. A simple mapping applies, for internally referenced as 06-series. A simple mapping applies, for
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