You can configure multiple component carriers within a subblock by specifying the carrier spacing so that the carriers do not overlap.

Component Carrier Spacing Type

Component carrier spacing defines the spacing between adjacent component carriers within a subblock. If you set the Component Carrier Spacing Type property to Nominal or Minimum, the measurement calculates the frequency spacing between component carriers based on section 5.4.1A of the 3GPP TS 36.521 specification and updates the component carrier frequency for each of the component carriers. If you set the Component Carrier Spacing Type property to User, you must set the component carrier frequency for each of the component carriers as an offset relative to the center frequency of the subblock.

Component Carrier at Center Frequency

Specifies the index of the component carrier having its center at the user-configured center frequency. RFmx LTE uses this property along with the component carrier spacing type to calculate the component carrier frequency. This property is ignored if you set the CC Spacing Type property to User.

Valid values are {-1, 0, 1,... n - 1}, where n is the number of component carriers in this subblock. If a value between 0 and n - 1 is specified, the specified component carrier is centered on the value specified in the subblock Center Frequency property. If the value is -1, the component carrier frequency values for each carrier are calculated such that the center of aggregated carriers (subblock) lies at the value specified in the subblock Center Frequency property.

The following image is an example of configuring multiple component carriers within a subblock, where the configuration and implication are as follows:

  • Configuration:
    • Spacing: Nominal, -1
    • Bandwidth: 20 MHz + 10 MHz
    • Center Freq: 1 GHz
  • Implication:
    • CC Frequency Offsets: Located -4.95 MHz and +9.45 MHz from the center frequency so that 1 GHz is in the middle of the aggregated bandwidth
    • Center Freq: 1 GHz


If you set the subblock frequency to 1 GHz, the component carrier at center frequency to -1, and the bandwidth combination of {20 MHz +10 MHz} with a nominal spacing of 14.4 MHz, the component carriers (CC-A0 and CC-A1) are placed such that 1 GHz becomes the center of the aggregated carriers.

The CC-A0 carrier offset, with respect to 1 GHz, is -4.95 MHz, and the CC-A1 carrier offset, with respect to 1 GHz, is +9.45 MHz, while keeping their nominal spacing unchanged.

The following image is another example of configuring multiple component carriers within a subblock, where the configuration and implication are as follows:

  • Configuration:
    • Spacing: Nominal, 1
    • Bandwidth: 20 MHz + 10 MHz
    • Center Freq: 1 GHz
  • Implication:
    • CC Frequency Offsets: Located -14.4 MHz and 0 from center frequency
    • Center Freq: 1 GHz


If you set the center frequency to 1 GHz, the component carrier at center frequency to 1, and the bandwidth combination is {20 MHz +10 MHz} with nominal spacing of 14.4 MHz.

The second component carrier (CC-A1) is centered at 1 GHz and the first component carrier (CC-A0) is nominally spaced in the left side from 1 GHz.

The component carrier frequencies or frequency offsets for CC-A0 and CC-A1 from 1 GHz are considered as -14.4 MHz and 0 while their relative spacing is unchanged.