ThisdocumentprovidesabriefoverviewoftheLTEnetworkarchitectureasthefirsttechnicaldocumentof“LTE”area.First,theLTEnetworkreferencemodelisdefinedanditsbasicEvolvedPacketSystem(EPS)entitiesandthefunctionsofeachentityaredescribed.Next,theinterfacesbetweentheEPSentitiesand