Alcatel Lucent

Bruce Zhao

Lu Tian

Ping Sha

Eddy Lin

A Gateway Mobile Switching Center (GMSC) of a home Public Land Mobile Network (PLMN) is provided. In one embodiment, the GMSC is configured, for receiving a roaming caller originated call from a visited PLMN including a Routing Number (RN), validating the RN against configured Network Camel Subscription Information (N-CSI) in response to receiving the roaming caller originated call, and sending a home network issued Initial Detection Point (IDP) to a Service Control Point (SCP) of the home PLMN in response to the RN being successfully validated. The home network issued IDP includes said RN. The GMSC is further configured for receiving at least a portion of information for facilitating connection of the roaming caller originated call from the SCP of the home PLMN and facilitating connection of the roaming caller originated call in response to receiving the at least portion of the information.

Inter-PLMN roaming

A method for facilitating inter-PLMN (Public Land Mobile Network) roaming comprises a plurality of operations. A home PLMN of a caller's wireless communication device performs an operation for determining that the caller's wireless communication device is not located in the home PLMN and, in response to determining that the caller's wireless communication device is not located in the home PLMN, an operation for facilitating a call routing service in a Service Control Point (SCP) of the home PLMN. The call routing service causes a call originated by the caller's wireless communication device while roaming in a visited PLMN to be routed back to a Gateway Mobile Switching Center (GMSC) of the home PLMN thereby allowing the home PLMN to have control over the roaming caller originated call and to have limited dependency on the visited PLMN.

Growing community of inventors

Plano, TX, United States of America

Bruce Zhao