Essential one-way latency contribution factors
Essential one-way latency contribution factors
Open Lightbox

Test consideration for low latency communication

Make the right design decision and ensure best in class implementation of the latency critical components.

The one-way end-to-end communication latency is a critical performance parameter for the majority of IoT applications. The typical requirements range from minutes for environmental sensors or smart meters to less than 100 ms for voice communication or to less of one millisecond in factory automation. There are several factors influencing the end-to-end latency such as scheduling schemes, link transmission speed or distance. Considering all relevant aspects of the end-to-end packet flow should result in selecting the appropriate architecture, technologies and features to meet the application requirements. Finally, the latency on the wireless communication interface is dependent on the best-in-class RF performance.

Testing low latency designs

For the design of low latency devices and network elements, it is essential to understand the different sources of delay and the influence of changes in configurations. There are various possibilities to measure the latency for this purpose. It could be the good old PING, which just gives a rough estimation of the two way latency or using IETF standards defined originally for service level agreement verification. An example for this is two-way active measurement protocol (RFC 5357), which allows also accurate one-way measurements in case of time synchronized endpoints.

Best-in-class RF performance

The RF performance of a wireless device is one of the key elements for the low latency design. For example, in difficult RF conditions, the packets need to be repeated and there is a need to switch to a more stable modulation scheme. This results in lower communication speed or the use of technologies applying coverage enhancements procedures. Therefore, having an eye on the RF and antenna performance and testing the overall RF performance including receiver sensitivity is of utmost importance.

Related topics

Network testing in smart factories

Network testing in smart factories

More information

RF performance and coverage of IoT devices

RF performance and coverage of IoT devices

More information

Request information

Do you have questions or need additional information? Simply fill out this form and we will get right back to you.

I want to receive information from Rohde & Schwarz via

Marketing permission

What does this mean in detail?

I agree that Rohde & Schwarz GmbH & Co. KG and the Rohde & Schwarz entity or subsidiary company mentioned in the imprint of this website, may contact me via the chosen channel (email or postal mail) for marketing and advertising purposes (e.g. information on special offers and discount promotions) related to, but not limited to, products and solutions in the fields of test and measurement, secure communications, monitoring and network testing, broadcast and media, and cybersecurity.

Your rights

This declaration of consent may be withdrawn at any time by sending an email with the subject "Unsubscribe" to Additionally, a link to unsubscribe from future email advertisements is contained in each email sent. Further details on the use of personal data and the withdrawal procedure are set out in the Statement of Privacy.

Your request has been sent successfully. We will contact you shortly.
An error is occurred, please try it again later.