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Revision A, January 2006

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Source-Controlled Variable-Rate Multimode Wideband Speech Codec (VMR-WB) - Service Options 62 and 63 for Spread Spectrum Systems

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Service Options 62 and 63, the source-controlled variable-rate multimode wideband speech codec (VMR-WB), provides two-way voice communication between the base station and the mobile station using the dynamically variable data rate speech codec algorithm described in this standard. The transmitting speech codec receives voice samples and generates an encoded speech packet for every Traffic Channel frame*. The receiving station generates a speech packet from every Traffic Channel frame and supplies it to the speech codec for decoding into voice samples.

It should be noted that the contents of this document describe all operational modes of the VMR-WB codec inclusive of the AMR-WB interoperable mode and its associated circuit-switched interworking functions. While both Service Options 62 and 63 as well as the AMR-WB interoperable mode share the same algorithmic description, Service Option 62 provides methods for initialization and call setup using VMR-WB modes 0, 1, 2, and 2 with maximum half-rate. Service Option 63 includes VMR-WB modes 4 and 4 with maximum half-rate. Furthermore Service Options 62 and 63 shall be the primary Service Options for circuit-switched wideband voice calls in cdma2000® terminals that support VMR- WB codec. The applications and call setup using the AMR-WB interoperable mode are beyond the scope of this document.

VMR-WB modes 0, 1, 2, and 3 communicate at one of four rates: 13300 bps, 6200 bps, 2700 bps and 1000 bps corresponding to Rate-Set II of CDMA systems, whereas VMR-WB mode 4 communicates at one of three rates: 8550 bps, 4000 bps, and 800 bps corresponding to Rate-Set I of CDMA systems Note that Rate-Set I Quarter-Rate is not used.

During an interoperable interconnection using VMR-WB mode 3, the operation bandwidth shall be wideband and switching to other modes shall not be allowed.

All implementations shall meet the minimum performance requirements defined in TIA-1017-A.

The algorithmic description and the operation of Rate-Set II compliant modes of VMR-WB (i.e., VMR WB mode 0, 1, 2, 2 with maximum half-rate, and 3) are identical to those described in [30].

*TIA-2000.3-D uses the term "frame" to represent a 20 ms grouping of data on the Fundamental Channel. Common speech codec terminology also uses the term "frame" to represent a quantum of processing. For Service Option 62, the speech codec frame corresponds to speech sampled over 20 ms. The speech samples are processed into a packet. This packet is transmitted in a Traffic Channel frame.

cdma2000® is the trademark for the technical nomenclature for certain specifications and standards of the Organizational Partners (OPs) of 3GPP2. Geographically (and as of the date of publication), cdma2000® is a registered trademark of the Telecommunications Industry Association (TIA–USA) in the United States.