Inhaltsverzeichnis

EARFCN

EARFCN steht für E-UTRA Absolute Radio Frequency Channel Number. It’s a standardized identifier used in LTE (Long-Term Evolution) und LTE-Advanced cellular networks to uniquely specify the center frequency of a radio channel. Instead of dealing with raw frequencies (z.B., 2140 MHz), network engineers and equipment use EARFCN values for simplicity and consistency.

EARFCN provides a consistent way to reference LTE carrier frequencies globally. FDD (Duplex der Frequenzteilung): Separate EARFCN for UL and DL. TDD (Zeitduplex): Single EARFCN (UL/DL share frequency).

UVP

UVP (Reference Signal Received Power) is a critical measurement in LTE (Long-Term Evolution) und 5G-NR (New Radio) networks that quantifies the Signalstärke from a cell tower (eNodeB/gNodeB) at your device (UE). It’s essential for network performance, handover decisions, und Benutzererfahrung.

RSRP measures: The average power (im dBm) received from a single cell-specific reference signal (CRS) over a specific bandwidth (typically one resource block ≈ 180 kHz). Focuses nur on reference signals—not the entire channel noise or interference.

Typical RSRP Values:

UVP (dBm)	Signalqualität
> -80 dBm	Exzellent (stark)
-80 nach -90 dBm	Gut
-90 nach -100 dBm	Fair (usable)
< -100 dBm	Arm (weak/unstable)
< -120 dBm	Kein Signal

SNR

SNR (Signal-Rausch-Verhältnis) measures the strength of a desired signal relative to background noise. It quantifies how clearly a signal can be distinguished from interference in communication systems (Wi-Fi, zellulär, Audio-, etc.). SNR is critical for performance—higher SNR means clearer data transmission, fewer errors, and faster speeds.

SNR-Bereich	Performance Impact
> 30 dB	Flawless 4K streaming, low-latency gaming.
20–30 dB	Smooth HD video, fast browsing.
10–20 dB	Basic web browsing; occasional buffering.
0–10 dB	Unstable connectivity; frequent drops.
< 0 dB	Connection lost (noise overwhelms signal).

SNR vs. Related Metrics:

Metrisch	Fokus	SNR Comparison
UVP	Raw signal strength (LTE/5G).	SNR depends on RSRP—but subtracts noise.
RSSI	Total received power (Signal + Lärm).	SNR = (RSSI – Lärm) / Lärm.
Sinr	Signal vs. Lärm + Interferenz (more precise).	Often used interchangeably with SNR.

QOS

Explanation of common terms in Vcan2024 QOS

QoS (Servicequalität) is a set of technologies and policies used in networking to prioritize traffic, manage bandwidth, und ensure reliable performance for specific applications, Benutzer, or services. It’s critical for maintaining consistent user experiences, especially in networks with limited resources (z.B., zellulär, enterprise, or IoT networks).

Key Goals of QoS:

Priorisierung: Treat high-importance traffic (z.B., video calls, Rettungsdienste) wie „VIP“ over low-priority traffic (z.B., file downloads).
Resource Allocation: Reserve bandwidth for critical tasks.
Minimize Latency/Jitter: Keep delays low for real-time apps (VoIP, Spiele).
Reduce Packet Loss: Ensure data isn’t dropped during congestion.

RSSI

RSSI (Stärkeanzeige des empfangenen Signals) is a measurement of the total received power (Signal + Lärm + Interferenz) in a wireless communication system. It’s a fundamental metric used across Wi-Fi, zellulär (LTE/5G), Bluetooth, and IoT networks to gauge raw signal strength—but it does not distinguish between useful signals and noise.

typisch negative values (since dBm is referenced to 1 Milliwatt):

-30 dBm: Extremely strong (near transmitter).
-70 dBm: Mäßig (reliable connectivity).
<-90 dBm: Schwach (unstable or unusable).

Comuart

COMUART bezieht sich auf a UART (Universal Asynchronous Receiver / Transmitter) interface used for serielle Kommunikation, typically found in embedded systems, networking hardware, or industrial devices. Das „Com“ prefix often denotes its role in communication ports (z.B., RS-232, TTL-Seriennummer).