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UMTS Parameterization Overview

Many parameters must be defined to generate UMTS waveforms. To organize parameters for initialization, review, and use, the LTE System Toolbox™ product groups relevant UMTS parameters into structures.

To generate downlink or uplink UMTS waveforms, you must define the waveform properties and the channels you want to include in the waveforms. Separate downlink and uplink configuration structures consolidate the parameters required to initialize and generate a waveform for the target link direction.

Downlink Reference Channel and Waveform Generation Parameter Structures

Defining a downlink waveform requires initialization of a handful of top-level parameters and substructures associated with permissible channels. The top level parameters include TotFrames, PrimaryScramblingCode, FilterType, OversamplingRatio, and NormalizedPower. The channel substructures can include combinations of the following channels: DPCH, PCCPCH, SCCPCH, PCPICH, SCPICH, PSCH, SSCH, PICH, HSDPA, and OCNS. You only include and initialize the individual channel substructures needed to generate desired waveform.

The umtsDownlinkReferenceChannels function initializes the configuration structure based on an input character vector argument aligning with one of the reference channels defined in the following 3GPP standards:

  • Downlink W-CDMA reference measurement channel (RMC) waveforms, as defined in TS 25.101, Annex A3 [1].

  • HSDPA fixed reference channel (FRC) H-Set waveforms, as defined in TS 25.101, Annex A7 [1].

  • Downlink test model waveforms, as defined in TS 25.141, Section 6.1.1 [2].

You can generate waveforms using umtsDownlinkWaveformGenerator with an input configuration structure that you:

  • Initialize by calling umtsDownlinkReferenceChannels, specifying one of the predefined reference channels as an input

  • Initialize to one of the predefined reference channels as above, and adjust settings manually

  • Manually initialize, complying with the structure defined as input to umtsDownlinkWaveformGenerator

The following image shows the downlink reference channel configuration structure fields. The left side of the figure expands the substructures to reveal fields in the top half of the structure. The right side of the figure expands the substructures to reveal fields in the bottom half of the structure.

Note

The single output data stream from the TrCH multiplexing, including the downlink DTX indication bits, is denoted as the coded composite transport channel (CCTrCH). A CCTrCH can be mapped to one or several physical channels. Each physical channel substructure (DPCH, PCCPH, and SCCPCH) can contain one CCTrCH substructure which in turn contains one or more TrCH substructures. Each CCTrCH substructure is individually initialized and fully parameterizable. The general TrCH coding and multiplexing and the CCTrCH processing are defined in TS 25.212, Section 4.2 [3]. TS 25.302, Section 6 [4] specifies C/I, the power control and duplex mode restrictions when mapping multiple CCTrCH on a physical channel.

Note

Each instance of the CCTrCH substructure contains the same fields, so the contents is only expanded in the first appearance the figure.

Uplink Reference Channel and Waveform Generation Parameter Structures

Defining an uplink waveform requires initialization of a handful of top-level parameters and substructures associated with permissible channels. The top level parameters include TotFrames, ScramblingCode, FilterType, OversamplingRatio, and NormalizedPower. The channel substructures can include combinations of the following channels DPDCH, DPCCH, HSUPA, and HSDPCCH. Each channel substructure includes the fields necessary to specify the indicated channel. You only include and initialize the individual channel substructures needed to generate desired waveform.

The umtsUplinkReferenceChannels function outputs a configuration structure based on an input character vector argument, which maps to one of the reference channels defined in the following 3GPP standards:

  • Uplink RMC configurations, as defined in TS25.101, Annex A2 [1].

  • Uplink E-DPDCH FRC configurations, as defined in TS 25.141, Annex A10, [2].

You can generate waveform using umtsUplinkWaveformGenerator with an input configuration structure that you:

  • Initialize by calling umtsUplinkReferenceChannels, specifying one of the predefined reference channels as an input

  • Initialize to one of the predefined reference channels as above, and adjust settings manually

  • Manually initialize complying with the structure defined as input to umtsUplinkWaveformGenerator

The following image shows the uplink reference channel configuration structure.

Note

The single data stream output from the TrCH multiplexing is denoted as the coded composite transport channel (CCTrCH). A CCTrCH can be mapped to one or more physical channels. The DPDCH substructure can contain one or more CCTrCH substructures. Each CCTrCH substructure is individually initialized and fully parameterizable. The general TrCH coding and multiplexing and the CCTrCH processing are defined in TS 25.212, Section 4.2 [3]. TS25.302, Section 6 of [4] specifies C/I, the power control and duplex mode restrictions when mapping multiple CCTrCH on the physical channel.

References

[1] 3GPP TS 25.101. “User Equipment (UE) radio transmission and reception.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: http://www.3gpp.org.

[2] 3GPP TS 25.141. “Base Station (BS) conformance testing (FDD).” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: http://www.3gpp.org.

[3] 3GPP TS 25.212. “Multiplexing and channel coding (FDD).” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: http://www.3gpp.org.

[4] 3GPP TS 25.302. “Services provided by the physical layer.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: http://www.3gpp.org.

See Also

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