name: ARFCN
full_form: Absolute Radio Frequency Channel Number
context: not perform any transmissions due to outdated satellite ephemeris, common TA or GNSS position based on timers. In connected mode, upon outdated satellite ephemeris and common Timing Advance, the UE re-acquires the broadcasted parameters and upon outdated GNSS position the UE moves to idle mode. The UEs may be configured to report Timing Advance at initial access or in connected mode. In connected mode triggered reporting of the Timing Advance is supported. For downlink synchronization in case of NB-IoT, the two LSB of the ARFCN is signalled in MIB for bands for which a 200 kHz channel raster is not supported, and the legacy 100 kHz raster is used. Otherwise, for bands for which a 200 kHz channel raster is supported, there is no signalling of ARFCN information in MIB. Downlink and uplink timings are frame aligned at the uplink time synchronization reference point (RP). To accommodate the long propagation delays in NTN, the timing relationships are enhanced by the support of two
description: The Absolute Radio Frequency Channel Number (ARFCN) is a critical network attribute used for identifying and managing radio frequency channels within telecommunications networks. It plays a crucial role in ensuring proper channel allocation, synchronization, and timing adjustments, especially in the context of Non-Terrestrial Networks (NTNs) and Narrowband Internet of Things (NB-IoT) communications.
explanation: The provided text explicitly states that ARFCN is a "critical network attribute" used for managing radio frequency channels. This definition aligns with the characteristics of a parameter, which is a measurable or configurable value within a system.
section_title: 5.2	NB-IoT/eMTC support for Non-Terrestrial Networks
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