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To derive various technical, functional, and other requirements without any ambiguity, the contents of a 3GPP technical specification should be understood and decoded properly. A 3GPP technical specification description contains the following types of requirements.

 Normative

Such requirements must be complied with.

 Informative

Such requirements if ignored, it does not matter. Note that a technical report is always an informative one.

To identify the above requirement types, a 3GPP specification/text description may contain the following auxiliary verbs:

 Shall/Shall not – This is a normative and implies a mandatory requirement.

 May/Need not – This is a normative and optional requirement.

 Should/Should not – This is a normative and Recommendation requirement.

 Can/Cannot – This is a normative and possibility/capability requirement.

Also, a 3GPP technical description is described using an active voice rather than a passive voice. For example, “The MS shall perform…” rather than the “…routing area update shall be performed by the MS”.