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3GPP introduced carrier aggregation (CA), which enables higher data throughput in the uplink and downlink by aggregating bandwidth of multiple contiguous or non-contiguous component carriers (CCs) to serve a carrier aggregation-capable UE. In 3GPP Release 18, The maximum number of configured CCs for a UE is 16 for DL and 16 for UL.
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In 5G NR, Carrier Aggregation is supported for low and mid-band frequencies below 7 GHz (Frequency Range 1 or FR1) and for high band millimetre wave frequencies above 24 GHz (Frequency Range 2 or FR2).
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3GPP Release 18 supports different types of Carrier Aggregation (CA) both in FR1 and FR2 as follows:
- FR1/FR2: Intra-band contiguous CA
- FR1/FR2: Intra-band Non-contiguous CA
- FR1:Inter-Band CA (two bands, three bands, four bands, five bands, six bands)
- FR2:Inter-band CA (two bands)
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Here I try to depict 5G NR FR1 Inter-band CA by aggregating bandwidth of four Carrier Components.
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