فهرست مطالب
EARFCN
EARFCN مخفف E-UTRA Absolute Radio Frequency Channel Number. It’s a standardized identifier used in LTE (Long-Term Evolution) و LTE-Advanced cellular networks to uniquely specify the center frequency of a radio channel. Instead of dealing with raw frequencies (به عنوان مثال, 2140 مگاهرتز), network engineers and equipment use EARFCN values for simplicity and consistency.
EARFCN provides a consistent way to reference LTE carrier frequencies globally. FDD (تقسیم فرکانس دوتایی): Separate EARFCN for UL and DL. TDD (بخش زمانی دوپلکس): Single EARFCN (UL/DL share frequency).
RSRP
RSRP (Reference Signal Received Power) is a critical measurement in LTE (Long-Term Evolution) و 5G-NR (New Radio) networks that quantifies the قدرت سیگنال from a cell tower (eNodeB/gNodeB) at your device (UE). It’s essential for network performance, handover decisions, و تجربه کاربری.
RSRP measures: The average power (که در DBM به) received from a single cell-specific reference signal (CRS) over a specific bandwidth (typically one resource block ≈ 180 کیلوهرتز). Focuses فقط on reference signals—not the entire channel noise or interference.
Typical RSRP Values:
| RSRP (DBM به) | Signal Quality |
|---|---|
| > -80 DBM به | عالی (قوی) |
| -80 به -90 DBM به | خوب |
| -90 به -100 DBM به | Fair (usable) |
| < -100 DBM به | فقیر (weak/unstable) |
| < -120 DBM به | بدون سیگنال |
SNR
SNR (نسبت سیگنال به نویز) 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 (وای فای, سلولی, سمعی, و غیره.). SNR is critical for performance—higher SNR means clearer data transmission, fewer errors, and faster speeds.
| SNR Range | Performance Impact |
|---|---|
| > 30 دسی بل | Flawless 4K streaming, low-latency gaming. |
| 20-30 دسی بل | Smooth HD video, fast browsing. |
| 10–20 dB | Basic web browsing; occasional buffering. |
| 0–10 dB | Unstable connectivity; frequent drops. |
| < 0 دسی بل | Connection lost (noise overwhelms signal). |
SNR vs. Related Metrics:
| متریک | تمرکز | SNR Comparison |
|---|---|---|
| RSRP | Raw signal strength (LTE/5G). | SNR depends on RSRP—but subtracts noise. |
| RSSI | Total received power (سیگنال + سر و صدا). | SNR = (RSSI – سر و صدا) / سر و صدا. |
| متصدی | Signal vs. سر و صدا + دخالت (more precise). | Often used interchangeably with SNR. |
QOS
QoS (کیفیت خدمات) is a set of technologies and policies used in networking to prioritize traffic, manage bandwidth, و ensure reliable performance for specific applications, کاربران, or services. It’s critical for maintaining consistent user experiences, especially in networks with limited resources (به عنوان مثال, سلولی, enterprise, or IoT networks).
Key Goals of QoS:
- Prioritization: Treat high-importance traffic (به عنوان مثال, تماس های ویدیویی, خدمات اضطراری) مانند “VIP” over low-priority traffic (به عنوان مثال, file downloads).
- Resource Allocation: Reserve bandwidth for critical tasks.
- Minimize Latency/Jitter: Keep delays low for real-time apps (روتوی, بازی).
- Reduce Packet Loss: Ensure data isn’t dropped during congestion.
RSSI
RSSI (نشانگر قدرت سیگنال دریافتی) is a measurement of the total received power (سیگنال + سر و صدا + دخالت) in a wireless communication system. It’s a fundamental metric used across Wi-Fi, سلولی (LTE/5G), بلوتوث, and IoT networks to gauge raw signal strength—but it does not distinguish between useful signals and noise.
معمولا negative values (since dBm is referenced to 1 میلی وات):
- -30 DBM به: Extremely strong (near transmitter).
- -70 DBM به: معتاد (reliable connectivity).
- <-90 DBM به: ضعیف (unstable or unusable).
Comuart
COMUART به الف اشاره دارد UART (گیرنده/فرستنده ناهمزمان جهانی) interface used for ارتباط سریال, typically found in embedded systems, networking hardware, or industrial devices. این “COM” prefix often denotes its role in communication ports (به عنوان مثال, RS-232, سریال TTL).
AT Debugging
CX6779K Version
سوال بپرسید
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