The present document defines a dictionary of parameters that are commonly used in multiple TC LI specifications. Aside from defining a dictionary@ the present document aims to provide technical means for other specifications to use. It is encouraged to use the present document in the development of new specifications. It is foreseen that regular maintenance of the present document is be required. As such release management requirements will be defined. Before accepting any new common parameter@ the present document will provide a set of requirements the parameter has to comply to in order to become a common parameter.