US Patent No. 10,142,956

APPARATUSES AND METHODS FOR PROVIDING ASSISTANCE INFORMATION FOR CALLS UNDER ISOLATED E-UTRAN OPERATION FOR PUBLIC SAFETY (IOPS)


Patent No. 10,142,956
Issue Date November 27, 2018
Title Apparatuses And Methods For Providing Assistance Information For Calls Under Isolated E-utran Operation For Public Safety (iops)
Inventorship Wei-Chieh Tsai, New Taipei (TW)
Assignee ACER INCORPORATED, New Taipei (TW)

Claim of US Patent No. 10,142,956

5. A Mobility Management Entity (MME) of a sub-access network, which is coupled to a cellular station, comprising:a controller; and
a non-transitory computer readable storage medium, configured to store instructions which, when executed by the controller, cause the controller to perform steps comprising:
in response to the sub-access network not being an Operation for Public Safety (IOPS) network,
receiving a first Attach Request message comprising an IOPS indicator from a mobile communication device via the cellular station, wherein the IOPS indicator indicates that the mobile communication device supports IOPS,
transmitting an authentication information request message comprising the IOPS indicator to a Home Subscriber Server (HSS) in response to the first Attach Request message comprising the IOPS indicator,
receiving an authentication information response message comprising encrypted mapping information of an International Mobile Subscriber Identification (IMSI) and a first Mobile Station International Subscriber Directory Number (MSISDN) of the mobile communication device from the HSS,
transmitting a first Attach Accept message comprising the encrypted mapping information to the mobile communication device via the cellular station; and
in response to the sub-access network being the IOPS network,
broadcasting a Public Land Mobile Network (PLMN) Identification for IOPS via the cellular station,
receiving a second Attach Request message comprising the encrypted mapping information from the mobile communication device via the cellular station,
storing the encrypted mapping information in the non-transitory computer readable storage medium,
transmitting a second Attach Accept message to the mobile communication device via the cellular station without communicating with the HSS,
receiving a second Attach Complete message from the mobile communication device via the cellular station, and
decrypting the encrypted mapping information to determine whether the IMSI is corresponding to a second MSISDN in a call request to the mobile communication device.