TECHNICAL FIELD

This disclosure generally relates to the use of New Radio carrier aggregation using the same or mixed numerologies as between component carriers.

BACKGROUND

Wireless mobile communication technology uses various standards and protocols to transmit data between a node (e.g., a transmission station) and a wireless device (e.g., a mobile device). Some wireless devices communicate using orthogonal frequency-division multiple access (OFDMA) in a downlink (DL) transmission and single carrier frequency division multiple access (SC-FDMA) in an uplink (UL) transmission. Standards and protocols that use orthogonal frequency-division multiplexing (OFDM) for signal transmission include the third-generation partnership project (3GPP) long term evolution (LTE) and New Radio (NR), the institute of Electrical and Electronics Engineers (IEEE) 802.16 standard (e.g., 802.16e, 802.16m), which is commonly known to industry groups as WiMAX (Worldwide interoperability for Microwave Access), and the IEEE 802.11 standard, which is commonly known to industry groups as Wi-Fi.

In 3GPP radio access network (RAN) Long Term Evolution (LTE) and NR systems, the node may be a combination of Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node Bs (also commonly denoted as evolved Node Bs, enhanced Node Bs, eNodeBs, or eNBs) and Radio Network Controllers (RNCs), which communicates with the wireless device, known as a user equipment (UE). The downlink (DL) transmission may be a communication from the node (e.g., eNodeB) to the wireless device (e.g., UE), and the uplink (UL) transmission may be a communication from the wireless device to the node.

In LTE and NR, data may be transmitted from the eNodeB to the UE via a physical downlink shared channel (PDSCH). A physical downlink control channel (PDCCH) may be used to provide control information regarding a downlink PDSCH. A physical uplink control channel (PUCCH) may be used to acknowledge that data was received. Downlink and uplink channels or transmissions may use time-division duplexing (TDD) or frequency-division duplexing (FDD). Time-division duplexing (TDD) is an application of time-division multiplexing (TDM) to separate downlink and uplink signals. In TDD, downlink signals and uplink signals may be carried on a same carrier frequency (i.e., shared carrier frequency) where the downlink signals use a different time interval from the uplink signals, so the downlink signals and the uplink signals do not generate interference for each other. Frequency Division Multiplexing (FDM) is a type of digital multiplexing in which two or more bit streams or signals, such as a downlink or uplink, are transferred apparently simultaneously as sub-channels in one communication channel, but are physically transmitted on different resources. In frequency-division duplexing (FDD), an uplink transmission and a downlink transmission may operate using different frequency carriers (i.e. separate carrier frequency for each transmission direction). In FDD, interference may be avoided because the downlink signals use a different frequency carrier from the uplink signals.

