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Versions: (draft-ahmadi-avt-rtp-vmr-wb-extension) 00 01 02 RFC 4424

Audio Video Transport WG                                  Sassan Ahmadi
INTERNET-DRAFT
Expires: April 19, 2006                                October 19, 2005


      Real-Time Transport Protocol (RTP) Payload Format for the
   Variable-Rate Multimode Wideband (VMR-WB) Extension Audio Codec
             <draft-ietf-avt-rtp-vmr-wb-extension-02.txt>


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Abstract

   This document is an addendum to RFC xxxx, which specifies the
   RTP payload format for the Variable-Rate Multimode Wideband (VMR-WB)
   speech codec. This document specifies some updates in RFC xxxx to
   enable support for the new operating mode of VMR-WB standard (i.e.,
   VMR-WB mode 4). These updates do not affect the existing modes of
   VMR-WB already specified in RFC xxxx.

   The payload formats and their associated parameters, as well as all
   provisions, restrictions, use cases, features, etc. that are
   specified in RFC xxxx are applicable to the new operating mode with
   no exception.





Sassan Ahmadi                Standards Track                   [page 1]

INTERNET-DRAFT    VMR-WB Extension RTP Payload Format    October 2005

Table of Contents

1.Introduction.................................................2
2.Conventions and Acronyms.....................................2
3.The Variable-Rate Multimode Wideband (VMR-WB) Extension......3
4.The Necessary Updates in RFC xxxx............................3
5.Security Considerations......................................5
6.Public Specification.........................................5
7.IANA Considerations..........................................5
References.....................................................5
   Normative References........................................5
   Informative References......................................6
Author's Address...............................................6
IPR Notice.....................................................6
Copyright Notice...............................................7


1. Introduction

   This document is an addendum to RFC xxxx [2] and contains the
   necessary updates for the support of the new operating mode of 3GPP2
   VMR-WB standard [1]. The new mode of VMR-WB standard; i.e., VMR-WB
   mode 4, while operating at a lower data rate, has similar
   characteristics and functionalities compared to the existing modes
   of VMR-WB already included in RFC xxxx (e.g., variable bit rate,
   narrowband/wideband input/output speech/audio processing capability,
   continuous and discontinuous transmission, etc.). Therefore, all
   provisions and restrictions specified in RFC xxxx are applicable to
   all modes of the VMR-WB standard including the new mode, which is
   specified in this document. As a result, no new media type
   registration is required.

   The VMR-WB file format; i.e., for transport of VMR-WB speech data in
   storage mode applications, is specified in [1,4] and includes
   support for the new mode of operation.

   The following sections provide the necessary updates to
   RFC xxxx to enable support of VMR-WB mode 4.


2. Conventions and Acronyms

   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 RFC2119 [3].

   The following acronyms are used in this document:

    3GPP2  - The Third Generation Partnership Project 2
    CDMA   - Code Division Multiple Access
    VMR-WB - Variable-Rate Multimode Wideband Codec
    CMR    - Codec Mode Request
    DTX    - Discontinuous Transmission

Sassan Ahmadi                Standards Track                   [page 2]

INTERNET-DRAFT    VMR-WB Extension RTP Payload Format    October 2005

    RTP    - Real-Time Transport Protocol
    MIME   - Multipurpose Internet Mail Extension

3. The Variable-Rate Multimode Wideband (VMR-WB) Extension

   VMR-WB is the wideband speech-coding standard developed by
   Third Generation Partnership Project 2 (3GPP2) for
   encoding/decoding wideband/narrowband speech content in
   multimedia services in 3G CDMA cellular systems [1]. VMR-WB is a
   source-controlled variable-rate multimode wideband speech
   codec. It has a number of operating modes, where each mode is
   a tradeoff between voice quality and average data rate. The
   operating mode in VMR-WB (as shown in Table 2) is chosen based on
   the traffic condition of the network and the desired quality of
   service. The desired average data rate (ADR) in each mode
   is obtained by encoding speech frames at permissible rates (as shown
   in Tables 1 and 3) compliant with cdma2000 system depending on the
   instantaneous characteristics of input speech and the maximum and
   minimum rate constraints imposed by the network operator.

   The capabilities of the VMR-WB codec were extended through the
   addition of a new mode operating at lower average data rates,
   resulting in improved system capacity in IP and non-IP networks [1].

   As a result of this extension, certain reserved table entries in
   RFC xxxx are used to include support for the new operating mode.
   VMR-WB mode 4 is compliant with all applicable provisions and
   restrictions specified in RFC xxxx [2]. Note that the existing table
   entries of RFC xxxx remain unchanged (e.g., frame types, etc.) and
   the original modes of VMR-WB are not affected by these updates.

   The existing flexibility in RFC xxxx for future extensions allows
   the addition of the new mode without any impact on the
   interoperability with earlier implementations of RFC xxxx.

   The following sections provide the necessary updates that are
   required to be made in RFC xxxx.

   The provisions and considerations for implementation, congestion
   control, and security remain identical to those specified in
   RFC xxxx.


4. The Necessary Updates in RFC xxxx

   Table 1 of RFC xxxx is updated as follows:








Sassan Ahmadi                Standards Track                   [page 3]

INTERNET-DRAFT    VMR-WB Extension RTP Payload Format    October 2005

   +---------------------------+-----------------+---------------+
   |        Frame Type         | Bits per Packet | Encoding Rate |
   |                           |   (Frame Size)  |     (kbps)    |
   +---------------------------+-----------------+---------------+
   | Full-Rate                 |      266        |     13.3      |
   | Full-Rate                 |      171        |     8.55      |
   | Half-Rate                 |      124        |      7.2      |
   | Half-Rate                 |       80        |      4.0      |
   | Quarter-Rate              |       54        |      2.7      |
   | Quarter-Rate              |       40        |      2.0      |
   | Eighth-Rate               |       20        |      1.0      |
   | Eighth-Rate               |       16        |      0.8      |
   | Blank                     |        0        |       -       |
   | Erasure                   |        0        |       -       |
   | Full-Rate with Bit Errors |      171        |     8.55      |
   +---------------------------+-----------------+---------------+
   Table 1: cdma2000 system permissible frame types and their
   associated encoding rates

   Note that the new permissible rates correspond to cdma2000 rate-set
   I have been added to the table.

   Table 2 of RFC xxxx is updated as follows to include VMR-WB mode 4
   and VMR-WB mode 4 with maximum half-rate similar to that described
   in Section 2.4 of the revised VMR-WB specification [1].

   +-------+----------------------------------------------------------+
   | CMR   |                 VMR-WB Operating Modes                   |
   +-------+----------------------------------------------------------+
   |   0   | VMR-WB mode 3 (AMR-WB interoperable mode at 6.60 kbps)   |
   |   1   | VMR-WB mode 3 (AMR-WB interoperable mode at 8.85 kbps)   |
   |   2   | VMR-WB mode 3 (AMR-WB interoperable mode at 12.65 kbps)  |
   |   3   | VMR-WB mode 2                                            |
   |   4   | VMR-WB mode 1                                            |
   |   5   | VMR-WB mode 0                                            |
   |   6   | VMR-WB mode 2 with maximum half-rate encoding            |
   |   7   | VMR-WB mode 4                                            |
   |   8   | VMR-WB mode 4 with maximum half-rate encoding            |
   | 9-14  | (reserved)                                               |
   |  15   | No Preference (no mode request is present)               |
   +-------+----------------------------------------------------------+
   Table 2: List of valid CMR values and their associated VMR-WB
   operating modes.

   Note that CMR values 7 and 8 replace the reserved values in Table 2
   of RFC xxxx.

   Table 3 of RFC xxxx is updated as follows to include new frame types
   (FT) associated with VMR-WB mode 4.

   Note that the size of the frames are unique and different, allowing
   for the use of header-free payload format for all modes of
   operations [2].

Sassan Ahmadi                Standards Track                   [page 4]

INTERNET-DRAFT    VMR-WB Extension RTP Payload Format    October 2005

+----+--------------------------------------------+-------------------+
| FT |                Encoding Rate               | Frame Size (Bits) |
+----+--------------------------------------------+-------------------+
| 0  | Interoperable Full-Rate (AMR-WB 6.60 kbps) |       132         |
| 1  | Interoperable Full-Rate (AMR-WB 8.85 kbps) |       177         |
| 2  | Interoperable Full-Rate (AMR-WB 12.65 kbps)|       253         |
| 3  | Full-Rate 13.3 kbps                        |       266         |
| 4  | Half-Rate 6.2 kbps                         |       124         |
| 5  | Quarter-Rate 2.7 kbps                      |        54         |
| 6  | Eighth-Rate 1.0 kbps                       |        20         |
| 7  | Full-Rate 8.55 kbps                        |       171         |
| 8  | Half-Rate 4.0 kbps                         |        80         |
| 9  | CNG (AMR-WB SID)                           |        35         |
| 10 | Eighth-Rate 0.8 kbps                       |        16         |
| 11 | (reserved)                                 |         -         |
| 12 | (reserved)                                 |         -         |
| 13 | (reserved)                                 |         -         |
| 14 | Erasure (AMR-WB SPEECH_LOST)               |         0         |
| 15 | Blank (AMR-WB NO_DATA)                     |         0         |
+----+--------------------------------------------+-------------------+
Table 3:VMR-WB payload frame types for real-time transport

   Note that the new FT types associated with VMR-WB mode 4 replace the
   reserved entries 7, 8, and 10 in Table 3 of RFC xxxx and there are
   no changes in the existing entries of Table 3 of RFC xxxx.

   The 'mode-set' MIME parameter value 4 is defined to indicate that
   VMR-WB mode 4 is supported and used. Note that the active modes of
   operation are negotiated and agreed by the IP terminals through the
   offer-answer model provided in Section 9.3 of RFC xxxx [2].


5. Security Considerations

   Same as RFC xxxx


6. Public specification

   The VMR-WB speech codec including the new mode is specified in
   following 3GPP2 specification C.S0052-A version 1.0. Transfer
   methods are specified in RFC xxxx.


7. IANA Considerations

     None


References

Normative References


Sassan Ahmadi                Standards Track                   [page 5]

INTERNET-DRAFT    VMR-WB Extension RTP Payload Format    October 2005

   [1]  3GPP2 C.S0052-A v1.0 "Source-Controlled Variable-Rate
        Multimode Wideband Speech Codec (VMR-WB) Service Options
        62 and 63 for Spread Spectrum Systems", 3GPP2 Technical
        Specification, April 2005.

   [2]  S. Ahmadi, "Real-Time Transport Protocol (RTP) Payload Formats
        for the Variable-Rate Multimode Wideband (VMR-WB) Audio Codec",
        RFC xxxx, Internet Engineering Task Force, October 2005.

   [3]  S. Bradner, "Key words for use in RFCs to Indicate
        Requirement Levels", BCP 14, RFC 2119, Internet Engineering
        Task Force, March 1997.

Informative References

   [4]  3GPP2 C.S0050-A v1.0 "3GPP2 File Formats for Multimedia
        Services", 3GPP2 Technical Specification, October 2005.

   Any 3GPP2 document can be downloaded from the 3GPP2 web
   server, "http://www.3gpp2.org/", see specifications.


Author's Address

    Dr. Sassan Ahmadi             Email: sassan.ahmadi@ieee.org

    This Internet-Draft expires in six months from October 19, 2005.


RFC Editor Considerations

    The RFC editor is requested to replace all occurrences of xxxx with
    the RFC number that reference [2] will receive.


IPR Notice

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Sassan Ahmadi                Standards Track                   [page 6]

INTERNET-DRAFT    VMR-WB Extension RTP Payload Format    October 2005

    copyrights, patents or patent applications, or other proprietary
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    Copyright (C) The Internet Society (2005).  This document is
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Sassan Ahmadi                Standards Track                   [page 7]


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