SDL

A radio communication strategy primarily used in 4G LTE4G LTE: 4G LTE (Long Term Evolution) or the E-UTRAN (Evolved Universal Terrestrial Access Network), introduced in 3GPP Rel. 8, is the radio access component of the Evolved Packet System (EPS) - a purely IP based mobile network standard. As an evolution to 3G UMTS, 4G LTE shares many similarities, such as… and 5G NR5G NR: 5G was developed with three broad use case families in mind: enhanced mobile broadband (eMBB), massive machine-type communications (mMTC) and ultra-reliable low-latency communications (URLLC). eMBB focuses on across-the-board enhancements to the data rate, latency, user density, capacity and… systems where additional spectrum is allocated exclusively for downlink (base station to user equipment) communication. This method is particularly useful in situations where there is asymmetrical traffic demand, typically with a higher demand for downlink data. SDL bands are used in transcievers which use Carrier Aggregation, where the SDL band is added as a component carrier to increase downlink data speeds.