← Back to Glossary

Diameter Protocol

by Bethany Hendricks on Glossary • September 8, 2020

The Diameter protocol is an extensible protocol upon which custom protocols can be defined to provide new network services.

What Is The Diameter Protocol Used For?

Different diameter protocol interfaces are used in telecommunication networks, most commonly in IP-based mobile networks such as LTE, to control and coordinate network infrastructure usage by users.

The Diameter protocol interfaces initiate and maintain user network access sessions, enforce usage policies, quality of service, and metering and billing policies. They also provide other functionalities that telecommunication service providers employ to configure, monitor, and manage their networks.

Diameter vs RADIUS Protocol

The Diameter protocol's predecessor widely used to provide AAA network services is called RADIUS (Remote Authentication Dial-In User Service).

Improvements provided by the Diameter base in comparison to RADIUS include the use of TCP for reliable communication as opposed to UDP which is used by the RADIUS protocol.

How To Improve Diameter Protocol Reliability

Diameter load balancing is the distribution of Diameter-based control layer traffic to multiple backends for high availability.