What is lqi and rssi

Last updated: April 1, 2026

Quick Answer: LQI (Link Quality Indicator) and RSSI (Received Signal Strength Indicator) are complementary wireless metrics; RSSI measures the power of the received signal while LQI measures overall link quality including packet integrity, error rates, and reliability.

Key Facts

RSSI measures signal strength in dBm (decibels relative to one milliwatt) on a scale from -120 to 0 dBm
LQI measures overall connection quality on a 0-255 scale, accounting for signal integrity and packet errors
Both metrics are used in Zigbee, WiFi, Bluetooth, and other wireless protocols for network management
RSSI alone doesn't guarantee good link quality; strong signal strength doesn't mean reliable data transmission
Devices use both RSSI and LQI together to make optimal routing and connection decisions in mesh networks

RSSI and LQI: Understanding Wireless Metrics

RSSI (Received Signal Strength Indicator) and LQI (Link Quality Indicator) are two fundamental metrics used to evaluate wireless network connections. While they are related and often used together, they measure different aspects of wireless communication. Understanding both metrics is essential for diagnosing network issues, optimizing device placement, and ensuring reliable wireless communication in IoT and mesh network environments.

RSSI: Received Signal Strength Indicator

RSSI measures the power level of the received wireless signal, expressed in dBm (decibels relative to one milliwatt). Range: RSSI values typically range from -120 dBm (very weak signal) to 0 dBm (very strong signal). Measurement: RSSI is a simple, direct measurement of how strong the incoming signal is at the receiver's antenna. Limitations: RSSI alone doesn't indicate whether data is being transmitted reliably; strong signal strength doesn't guarantee error-free communication if there is significant interference or noise.

LQI: Link Quality Indicator

LQI provides a more comprehensive assessment of link quality by evaluating multiple factors beyond signal strength. Scale: LQI ranges from 0 (poor) to 255 (excellent). Factors Measured: LQI accounts for signal strength, packet reception rates, bit error rates, interference levels, and overall transmission reliability. Practical Value: LQI better reflects whether actual data communication will succeed, making it more useful for routing decisions in mesh networks.

Comparison and Relationship

While RSSI and LQI are related, they are not equivalent. A high RSSI value doesn't always correlate with a high LQI value if there is significant interference or environmental noise. Conversely, a location with moderate RSSI might have excellent LQI if there is minimal interference. Professional network analysis typically uses both metrics: RSSI for understanding signal propagation and identifying coverage areas, and LQI for assessing actual transmission reliability and network performance.

Aspect	RSSI	LQI
Full Name	Received Signal Strength Indicator	Link Quality Indicator
Measurement	Signal power in dBm	Overall link quality (0-255)
Scale	-120 to 0 dBm	0 to 255
What It Measures	Signal strength only	Signal integrity, packet errors, reliability
Usefulness	Coverage mapping, dead zone detection	Routing decisions, network reliability

More What Is in Daily Life

What Is a Credit ScoreA credit score is a three-digit number, typically ranging from 300 to 850, that represents your cred…
What Is CD rates make no sense based on length of time invested. Explain like I'm 5CD (Certificate of Deposit) rates often don't increase with longer lock-up times the way people expe…
What is a phdA PhD (Doctor of Philosophy) is a doctoral degree earned after completing advanced academic research…
What is a polymathA polymath is a person with deep knowledge and expertise across multiple different fields or academi…
What is aarch64ARMv8-A (commonly called ARM64 or AArch64) is a 64-bit processor architecture developed by ARM Holdi…
What is about menTopics and discussions about men typically encompass masculinity, male identity, gender roles, men's…
What is aaaAAA batteries are a standard cylindrical battery size measuring 10.5mm in diameter and 44.5mm in len…
What is aacAAC (Advanced Audio Codec) is a digital audio compression format that provides better sound quality …
What is aaa gameAAA games are high-budget video games developed by large studios with budgets typically exceeding $1…
What is a proxyA proxy is a server that acts as an intermediary between your device and the internet, forwarding yo…
What is advilAdvil is a brand name for ibuprofen, an over-the-counter nonsteroidal anti-inflammatory drug (NSAID)…
What is affiliationAffiliation is a formal connection or association between entities, such as individuals joining orga…
What is agoraphobiaAgoraphobia is an anxiety disorder characterized by intense fear of situations where escape might be…
What is a jockA jock is an athlete, especially in high school or college, known for participation in sports. The t…
What is a jesterA jester is a professional entertainer employed by royalty or nobility to provide humor, satire, and…
What is a juxtapositionJuxtaposition is a literary and rhetorical technique of placing two contrasting things side by side …
What is a juggernautA juggernaut is an unstoppable or overwhelming force, power, or person that crushes all opposition. …
What is a jointA joint is an anatomical structure where two or more bones meet and connect, allowing movement and f…
What is a jewA Jew is a person who practices Judaism, is of Jewish descent, or identifies with Jewish culture, et…
What is alsALS, or Amyotrophic Lateral Sclerosis, is a progressive neurodegenerative disease that affects nerve…