name: NRS
full_form: Narrowband Reference Signal
context: As defined in TS 38.401 [4]. ng-eNB-DU UE W1AP ID: As defined in TS 38.401 [4]. UE-associated signalling: When W1AP messages associated to one UE uses the UE-associated logical W1-connection for association of the message to the UE in ng-eNB-DU and ng-eNB-CU. UE-associated logical W1-connection: The UE-associated logical W1-connection uses the identities ng-eNB-CU UE W1AP ID and ng-eNB-DU UE W1AP ID according to the definition in TS 38.401 [4]. For a received UE associated W1AP message the ng-eNB-CU identifies the associated UE based on the ng-eNB-CU UE W1AP ID IE and the ng-eNB-DU identifies the associated UE based on the ng-eNB-DU UE W1AP ID IE. The UE-associated logical W1-connection may exist before the W1 UE context is setup in ng-eNB-DU.
description: The Narrowband Reference Signal (NRS) is a reference signal used in the Downlink (DL) of Narrowband Internet of Things (NB-IoT) to provide a reference for channel estimation and synchronization. The DL NRS power is indicated on the Downlink Shared Channel (DL-SCH) and has an absolute accuracy defined as the maximum deviation between the indicated power and the actual power at the Base Station (BS) antenna connector.
explanation: The context describes the Narrowband Reference Signal (NRS) in relation to its use in NB-IoT, specifically highlighting its role in providing a reference for channel estimation and synchronization. The mention of DL NRS power and its indication on the DL-SCH further supports the classification as a signal.
section_title: 6.2.5.1	Definition and applicability
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