Understanding Signal Quality: RSSI, RSRP, and RSRQ

Rose-Marie Henriksson

Technical Consultant, Eseye

LinkedIn

In this blog post, let’s explore the differences between Received Signal Strength Indicator (RSSI), Reference Signal Received Power (RSRP), and Reference Signal Received Quality (RSRQ), plus discover three key measures of signal quality. Read on to understand how and when each should be used in IoT.

Received Signal Strength Indicator (RSSI)

RSSI is a measure of the power level that a device receives from a signal. It is a general signal strength indicator and is used in various wireless communication standards, including Wi-Fi and cellular networks. RSSI values are typically measured in dBm (decibels relative to a milliwatt) and range from -100 dBm (weak signal) to 0 dBm (strong signal).

RSSI is useful for determining the proximity of a device to a signal source but does not provide detailed information about the quality of the signal.

Reference Signal Received Power (RSRP)

RSRP is a specific measure used in LTE (Long-Term Evolution) networks to assess the power level of the reference signal transmitted by a cell tower. It is more precise than RSSI as it focuses on the reference signals, which are crucial for maintaining a stable connection. RSRP values also range in dBm, typically from -140 dBm (very weak signal) to -44 dBm (very strong signal).

RSRP is essential for handover decisions and optimizing network performance, making it a critical metric for LTE networks.

Reference Signal Received Quality (RSRQ)

RSRQ is another measure used in LTE networks, which combines both the signal strength and the quality of the reference signal. It is calculated by dividing the RSRP by the RSSI, providing a ratio that indicates the quality of the signal relative to the noise and interference. RSRQ values range from -19.5 dB (poor quality) to -3 dB (excellent quality).

RSRQ is particularly useful for assessing the overall quality of the connection and is often used in conjunction with RSRP to make informed decisions about network performance and optimization.

Best measure and usage for connectivity performance

The best measure depends on the specific use case. For general signal strength, RSSI is sufficient. However, for LTE networks, RSRP and RSRQ provide more detailed and useful information. RSRP is best for assessing signal power and making handover decisions, while RSRQ is ideal for evaluating overall signal quality and network performance. Combining RSRP and RSRQ offers a comprehensive view of the network’s condition, making them the preferred metrics for LTE network optimization.

At Eseye, we specialize in providing global IoT connectivity solutions that ensure seamless and reliable communication for devices across various industries. Our products include the AnyNet+ SIM, which offers secure and resilient connectivity, and the Infinity IoT Platform, which provides comprehensive management and control over IoT deployments.

Trusted by global brands – Shell, Costa, BT, TELUS, and Amazon – we work closely with our customers from idea to implementation and beyond, to deliver near-100% connectivity
to millions of devices across the world. With our innovative solutions, we empower businesses to achieve their IoT goals with confidence and efficiency.

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Rose-Marie Henriksson

Technical Consultant, Eseye

LinkedIn

With extensive experience in IoT connectivity and network optimization, Rose-Marie plays a crucial role in helping our clients understand and implement the best connectivity solutions for their needs. Her expertise ensures that our clients can maximize the performance and reliability of their IoT devices, regardless of where they are deployed.

In this article

• Received Signal Strength Indicator (RSSI)
• Reference Signal Received Power (RSRP)
• Reference Signal Received Quality (RSRQ)
• Best measure and usage for connectivity performance