name: SUL
full_form: Supplementary uplink
context: 2.1GHz bands defined as SUL bands n83, n89, n81, n80 and n84 in which 2 SUL bands in conjunction with NR TDD bands, e.g. n78, n79 are highly interested by operators holding the spectrum to boost the wide band UL performance. It is known that SUL band combination includes one SUL band and one NR band in a single cell. Aggregating a SUL band combination with another NR band and follow CA framework to specify the band combination specific requirements was already supported in previous SUL basket WI. However, the current SUL basket WI only considers one SUL band. To address the specific spectrum demand by operators, it is preferred to have a dedicated spectrum WI for NR CA combinations with two SUL cells that follow CA framework specified by both RAN1 and RAN4 specifications. In addition, since both SUL bands and NR TDD bands could support different power classes, the requirements for NR CA with two SUL cells should cover at least PC3 and PC2 cases in Rel-18.
description: Supplementary Uplink (SUL) is a technology used to enhance uplink performance by aggregating a SUL band with an NR band, following the carrier aggregation (CA) framework. It allows for improved wide-band uplink performance and supports different power classes.
explanation: The context describes SUL as a technology that improves uplink performance through carrier aggregation. Its function is to enhance network capabilities, aligning it with the Technology category.
section_title: 4.1Background information
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biotag_Description: O,B-Connection,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O