A method for initiating a roaming communication link between a user equipment (UE) and a visited communication network , the method comprising: transmitting a registration request by the UE to a network entity of the visited communication network , wherein the registration request comprises an identity (UE ID) of the user equipment; detecting by the network entity of the visited communication network , based on the UE ID, that the registration request is related to a roaming communication with the UE ; determining by the network entity of the visited communication network a home communication network of the UE ; retrieving, by the network entity of the visited communication network, via a communication interface (R1) between the network entity and a remote data layer (RDL) entity , subscriber-specific data of the UE from a data repository of the remote data layer (RDL) entity of the visited communication network for initiating the roaming communication link of the UE in the visited communication network , wherein retrieving the subscriber-specific data of the UE is based on data base functions which only require a memory address for retrieving the user-specific data, wherein the memory address comprises a Public Land Mobile Network (PLMN) ID of another PLMN than the home communication network , wherein the RDL entity is coupled to the home communication network of the UE via a data base interface configured to retrieve the subscriber-specific data of the roaming UE from the home communication network ; initiating by the visited communication network the roaming communication link with the UE based on the subscriber-specific data of the UE received via the RDL entity ; and synchronizing, by the home communication network or by the visited communication network , the subscriber-specific data of the RDL entity with corresponding subscriber-specific data stored in the home communication network . transmitting a registration request by the UE to a network entity of the visited communication network , wherein the registration request comprises an identity (UE ID) of the user equipment; detecting by the network entity of the visited communication network , based on the UE ID, that the registration request is related to a roaming communication with the UE ; determining by the network entity of the visited communication network a home communication network of the UE ; retrieving, by the network entity of the visited communication network, via a communication interface (R1) between the network entity and a remote data layer (RDL) entity , subscriber-specific data of the UE from a data repository of the remote data layer (RDL) entity of the visited communication network for initiating the roaming communication link of the UE in the visited communication network , wherein retrieving the subscriber-specific data of the UE is based on data base functions which only require a memory address for retrieving the user-specific data, wherein the memory address comprises a Public Land Mobile Network (PLMN) ID of another PLMN than the home communication network , wherein the RDL entity is coupled to the home communication network of the UE via a data base interface configured to retrieve the subscriber-specific data of the roaming UE from the home communication network ; initiating by the visited communication network the roaming communication link with the UE based on the subscriber-specific data of the UE received via the RDL entity ; and synchronizing, by the home communication network or by the visited communication network , the subscriber-specific data of the RDL entity with corresponding subscriber-specific data stored in the home communication network . <EOS>