This document provides a reference of features and functions pertinent for interworking between eHRPD and EUTRAN@ and contains a list of specifications of both 3GPP and 3GPP2 for each of the features listed. 3GPP Rel. 8 is the first release for LTE@ and subject of Interworking Matrix in the current form. Revisions of this document will be used to address subsequent 3GPP releases.