Prashant Panigrahi

MAC (Medium Access Control) Architecture (25.321)

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MAC is a layer 2 protocol in the UMTS Access Stratum. MAC has the input as logical channels and at the output it has transport channels.
This tutorial covers only the MAC architecture.

The following sections are covered

  • MAC Architecture – UE Side
  • MAC Architecture – UTRAN Side
UMTS Logical Channels and Transport Channels

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Logical channels define ‘WHAT’ type of information is being transferred and transport channel defines ‘HOW’ the information is being transferred.

In this tutorial different types of logical channels and transport channels and their mappings are described.