name: SDL
full_form: Supplementary Downlink
context: composed by only FDD bands or only TDD bands, respectively. "FDD and TDD" refers to CA or EN-DC configuration including both FDD and TDD bands. "SDL and FDD, SDL and TDD" refers to CA configuration including both SDL and FDD bands or both SDL and TDD bands, respectively. "TDD and SUL" refers to SUL configuration including both TDD and SUL bands. "FDD and TDD and SUL" refers to EN-DC configuration including both FDD, TDD and SUL bands. Unless stated otherwise, the release independent for the band combinations are from Rel-15. Configurations with BCSs other than BCS5 are release independent from Rel-15, where the BCSs for configurations are defined in TS 38.101-1 [2] and/or TS 38.101-3 [4]. Configurations with BCS5 are release independent from Rel-17, and BCS5 with signalling is allowed for early implementation from Rel-15. Note that BCS4/BCS5 is not applicable to intra-band EN-DC configurations. When a new feature is introduced only the latest release of release independent spec needs
description: Supplementary Downlink (SDL) is a telecommunications technology that allows the use of extra downlink resources, like frequency bands, to improve network capacity and user experience. It's mentioned in 3GPP specifications alongside technologies like FDD, TDD, and SUL within Carrier Aggregation (CA) or EN-DC (Evolved Node Dual Connectivity) configurations.
explanation: SDL is classified as a Technology because it directly enhances network capabilities. Its presence in 3GPP standards and alongside other technologies like CA and EN-DC further solidifies its role as a key technological advancement in telecommunications.
section_title: 4General
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