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SAP Digital Interconnect Employee

LTE Basics - Diameter which Protocol?

As with all 4G networks, LTE is an IP based solution.


As MVNO networks grow the push is to standardise on the interfaces between different ‘function nodes’. Rather than have different vendors work on non-standard interfaces, 3GPP pushed to have Diameter used between next generation nodes to standardise the delivery of inter-node messages.


The protocol LTE Diameter uses is mainly SCTP (Streaming Control Transmission Protocol) but TCP can also be used.


The benefits of using SCTP are:


  • handles messages better
  • handles window size restrictions better
  • allows pooling of IP addresses
  • ensures message delivery.
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