LTE NAS-1Step

NAS-1Step is a Windows application that enables you to interactively create, view, and edit messages conforming to the 3GPP Technical Specification 24.301 (Non-Access-Stratum protocol). NAS-1Step consists of a main application and one or more plug-ins, each supporting a particular version of the NAS protocol.

NAS-1Step provides several functions, such as:

• A text viewer that displays a description of the structure of NAS messages in a formal notation (ASN.1) and supports both syntax coloring and syntax-aware navigation.
• A message viewer/editor able to load an encoded message from a file, decode the message, create a new message, make changes to a message, re-encode it, save it, and so on.

NAS-1Step is a useful tool for anyone working with the NAS protocol, from system designers to application developers and testers. It can be used for a range of activities, including displaying a NAS message in a collapsible tree-view, editing a NAS message, creating a set of NAS messages for testing purposes, and so on, and allows one to work simultaneously with messages belonging to multiple versions of the NAS protocol (multiple 3GPP releases).