LTE EARFCN Calculator: EARFCN to Frequency Conversion
LTE Downlink Frequency in MHz (Output1): {{ downlinkFrequency }}
LTE Uplink Frequency in MHz (Output2): {{ uplinkFrequency }}
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LTE EARFCN (E-UTRA Absolute Radio Frequency Channel Number) is a numbering system that simplifies the RF planning and maintenance process in LTE networks. It represents both downlink and uplink frequencies, making it easier to manage frequencies across the LTE spectrum.
Historical Background
The concept of EARFCN was developed to streamline the process of frequency allocation and identification in LTE systems, following the precedent set by GSM ARFCN and UMTS UARFCN. It simplifies the understanding and planning of network frequencies for engineers.
Calculation Formula
EARFCN to frequency conversion is governed by specific formulas, which vary depending on the frequency band and EARFCN range. The basic equation is:
\[ \text{Downlink Frequency (MHz)} = FDL_Low + 0.1 \times (N - NDL_Offset) \]
\[ \text{Uplink Frequency (MHz)} = FUL_Low + 0.1 \times (NUL - NUL_Offset) \]
Example Calculation
Using an EARFCN of 700 as input, the calculation might look like this:
- For EARFCN 700, it falls into the range where \( FDL_Low = 1930 \) MHz and \( NDL_Offset = 600 \).
- The downlink frequency would be calculated as \( 1930 + 0.1 \times (700 - 600) = 1940 \) MHz.
- Similarly, the uplink frequency calculation would follow its respective formula.
Importance and Usage Scenarios
EARFCN is crucial for LTE network planning, deployment, and operation. It enables:
- Simplified Frequency Management: Easier to communicate and manage frequencies.
- RF Planning: Essential for designing network coverage and capacity.
- Troubleshooting and Maintenance: Helps in quickly identifying and resolving frequency-related issues.
Common FAQs
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What does EARFCN stand for?
- E-UTRA Absolute Radio Frequency Channel Number.
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How is EARFCN different from ARFCN and UARFCN?
- It's specific to LTE networks, while ARFCN and UARFCN are for GSM and UMTS networks, respectively.
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Can EARFCN values overlap between downlink and uplink?
- EARFCN values are unique within their specific ranges and designed to avoid overlap, providing clear distinction between downlink and uplink frequencies.