Techniques for providing subscriber-specific routing of a roaming user equipment in a visited communication network

A method for initiating a roaming communication link with a user equipment (UE) in 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 between the network entity and a routing data layer (RDL) entity, subscriber-specific data of the UE from a routing data layer (RDL) entity of the visited communication network for roaming the UE in the visited communication network, wherein the RDL entity is coupled to the home communication network of the UE via a data base interface, the RDL being configured to store or provide a local replica of the subscriber-specific data of the UE;
• and
• initiating the roaming communication link with the UE in a network slice of the visited communication network based on the subscriber-specific data of the UE received via the RDL entity,
• the method further comprising requesting, by the RDL entity, the subscriber-specific data of the UE from a unified data repository (UDR) of the home communication network of the UE;
• wherein the data base interface provides a secure interface between the RDL entity and the UDR of the home communication network over which data of the RDL entity is synchronized with corresponding data of the UDR,
• wherein the network slice is based on multiple virtual networks having been created with each of said virtual networks including an independent set of logical network functions.

A method for initiating a roaming communication link with a user equipment (UE) in 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 between the network entity and a routing data layer (RDL) entity, subscriber-specific data of the UE from a data repository of the routing data layer (RDL) entity of the visited communication network for initiating the roaming communication link of the UE in the visited communication network based on the subscriber-specific data of the UE, wherein the RDL entity is coupled to the home communication network of the UE via a data base interface;
• and
• 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,
• 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.