The exemplary embodiments of the present disclosure provide a method and an apparatus for detecting an abnormal roaming request which acquires information of user equipment which sends a roaming request message, calculates a risk of the roaming request message using a roaming request location and a roaming request time of the user equipment, and safely processes the request according to the risk.

The exemplary embodiments of the present disclosure provide a method and an apparatus for detecting an abnormal roaming request which acquires information of user equipment which sends a roaming request message, calculates a risk of the roaming request message using a roaming request location and a roaming request time of the user equipment, and safely processes the request according to the risk.

A method for conducting a velocity check for outbound subscribers roaming to neighboring countries includes receiving, by a network gateway associated with a home country from an MSC associated with a neighboring country, an ingress signaling message related to a mobile device roaming in the neighboring country, sending, to an HLR in the home country, an interrogation request message containing a mobile subscriber identifier, and receiving an interrogation response message containing age of location information and cell identifier information corresponding to the mobile subscriber identifier. The method further includes utilizing the cell identifier information and a country code identifier included in the ingress signaling message to determine two latitude-longitude positions, determining an estimated transit time of the mobile device using the two latitude-longitude reference positions, and comparing age of location information with the estimated transit time to determine if the ingress signaling message is to be forwarded to the HLR.

A method for conducting a velocity check for outbound subscribers roaming to neighboring countries includes receiving, by a network gateway associated with a home country from an MSC associated with a neighboring country, an ingress signaling message related to a mobile device roaming in the neighboring country, sending, to an HLR in the home country, an interrogation request message containing a mobile subscriber identifier, and receiving an interrogation response message containing age of location information and cell identifier information corresponding to the mobile subscriber identifier. The method further includes utilizing the cell identifier information and a country code identifier included in the ingress signaling message to determine two latitude-longitude positions, determining an estimated transit time of the mobile device using the two latitude-longitude reference positions, and comparing age of location information with the estimated transit time to determine if the ingress signaling message is to be forwarded to the HLR.

Aspects of the subject disclosure may include, for example, a method in which a processing system authenticates a communication device roaming from a home network that does not support Voice over Long Term Evolution (VoLTE) roaming, and in which the processing system communicates with a packet gateway (PGW) of an evolved packet core (EPC) separate from the processing system, to facilitate communication between the communication device and a subsystem of the EPC; the subsystem emulates the home network to provide a VoLTE roaming service to the communication device. The communication device also engages in a session initiation protocol (SIP) with the subsystem to initiate a communication session with the subsystem; in accordance with the communication session, the subsystem provides the VoLTE roaming service to the communication device. Other embodiments are disclosed.

Aspects of the subject disclosure may include, for example, a method in which a processing system authenticates a communication device roaming from a home network that does not support Voice over Long Term Evolution (VoLTE) roaming, and in which the processing system communicates with a packet gateway (PGW) of an evolved packet core (EPC) separate from the processing system, to facilitate communication between the communication device and a subsystem of the EPC; the subsystem emulates the home network to provide a VoLTE roaming service to the communication device. The communication device also engages in a session initiation protocol (SIP) with the subsystem to initiate a communication session with the subsystem; in accordance with the communication session, the subsystem provides the VoLTE roaming service to the communication device. Other embodiments are disclosed.

Disclosed are a communication device having a base station function of a Digital Enhanced Cordless Telecommunications (DECT) cellular system, and a communication system. The communication device includes an IP phone and a DECT adapter. The IP phone is connected to the DECT adapter, to form a base station; and the DECT adapter is configured to wirelessly communicate with at least one cordless handset via DECT, so as to register information of the at least one cordless handset with the IP phone. The present application enables the IP phone to be externally connected to the DECT adapter to support a DECT mode, so that the IP phone possesses a base station function of a DECT cellular system. It is not required to deploy multiple different systems. Such an IP phone and other base stations can form a Multi-Cell DECT system, expanding the coverage of a DECT signal.

Disclosed are a communication device having a base station function of a Digital Enhanced Cordless Telecommunications (DECT) cellular system, and a communication system. The communication device includes an IP phone and a DECT adapter. The IP phone is connected to the DECT adapter, to form a base station; and the DECT adapter is configured to wirelessly communicate with at least one cordless handset via DECT, so as to register information of the at least one cordless handset with the IP phone. The present application enables the IP phone to be externally connected to the DECT adapter to support a DECT mode, so that the IP phone possesses a base station function of a DECT cellular system. It is not required to deploy multiple different systems. Such an IP phone and other base stations can form a Multi-Cell DECT system, expanding the coverage of a DECT signal.

A method performed by a system which manages station transition from a Wi-Fi access point includes sending, based on the station roaming to an edge-of-domain access point, a request to neighboring access points to the edge-of-domain access point for neighbor reports. The method includes receiving a cellular signal value from the station, comparing a first signal grade associated with the edge-of-domain access point to a second signal grade associated with the cellular signal value to yield a comparison and generating a link usability rating associated with a link between the station and the edge-of-domain access point. Based at least in part on the comparison and the link usability rating, the method includes transmitting a message to the station suggesting that the station roam from the edge-of-domain access point to a cellular network. An edge of the domain can also be dynamic and vary based on station characteristics.

A method performed by a system which manages station transition from a Wi-Fi access point includes sending, based on the station roaming to an edge-of-domain access point, a request to neighboring access points to the edge-of-domain access point for neighbor reports. The method includes receiving a cellular signal value from the station, comparing a first signal grade associated with the edge-of-domain access point to a second signal grade associated with the cellular signal value to yield a comparison and generating a link usability rating associated with a link between the station and the edge-of-domain access point. Based at least in part on the comparison and the link usability rating, the method includes transmitting a message to the station suggesting that the station roam from the edge-of-domain access point to a cellular network. An edge of the domain can also be dynamic and vary based on station characteristics.