Diameter (4G-LTE)

Diameter (4G-LTE) Software Development Services

Diameter (4G/LTE) is used when mobile users travel to another country and switch on their mobile device, the mobile phone will “register” to one of the local mobile networks. This registration process ensures the SIM card is valid and verifies which services the user is entitled to access.
Diameter is a message based protocol, in which AAA nodes exchange messages and receive Positive or Negative affirmation for each message exchanged between nodes. For message exchange, it internally uses the TCP and SCTP which makes diameter reliable.It provide you peer-to-peer architecture for greater flexibility. It is frequently used in IP Multimedia Subsystem (IMS) architecture. Basically, it is a successor of RADIUS which was less capable that preceded it.

In Diameter (4G/LTE) there are 5 major nodes that interact with each other.

  • Mobility Management Entity (MME)
  • Home Subscriber Server (HSS)
  • Serving Gateway (S-GW)
  • PDN Gateway (P-GW)
  • Policy and Charging control entity/Function (PCRF)


Our solution for 4G/LTE is based on diameter protocol that supports AAA( Authentication, Authorization, and Accounting). It also supports two other transport protocols: Stream Control Transmission Protocol (SCTP) and Transmission Control Protocol (TCP). The transport security is provided by Transport Layer Security (TLS). If we consider OSI Layered model it works on the Application Layer.
The main property of diameter is, every host who implements the Diameter protocol can act as a client as well as server depending on network deployment. There are two diameter nodes, one node receives the user connection request will act as the Diameter client. This node collects user information, such as username and password. This information is sent to another node for access acknowledgment. The second diameter node authenticates the provided information. The information is either accepted or rejected and a message is sent to the user for access deny or access allowed.


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Data (4G-3G)