PLMN Selection for Mission Critical Devices
AssigneeBlackBerry Limited
InventorsNicholas James Russell, Adrian Buckley, Jan Hendrik Lucas Bakker
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Abstract
A method for selecting a Public Land Mobile Network (PLMN) at a user equipment (UE), comprising receiving, from a network entity, a list of PLMN identifiers, attempting to register the UE with a network using at least one PLMN identifier from the list of PLMN identifiers, and if the attempt to register with the network is successful, performing a Session Initiation Protocol (SIP) registration to an Internet Protocol (IP) Multimedia Sub-system (IMS) associated to the PLMN identifier.
Claims20
A non-transitory computer readable medium having stored thereon computer-executable code for execution by a processor of a user equipment (UE) configured for selecting a Public Land Mobile Network (PLMN), the instruction code when executed causing the UE to:
- determine that a first trigger condition has been met;
- transmit to a network entity a message, the message comprising an indication that the first trigger condition has been met;
- receive, from the network entity, a list of PLMN identifiers, wherein each PLMN identifier in the list of PLMN identifiers corresponds to a PLMN that allows the UE to migrate to a new Mission Critical (MC) system;
- attempt to register the UE with a network using at least one PLMN identifier from the list of PLMN identifiers;
- and
- when the attempt to register with the network is successful, perform a Session Initiation Protocol (SIP) registration to an Internet Protocol (IP) Multimedia Sub-system (IMS) associated to the PLMN identifier;
- wherein the first trigger condition is the UE receiving an indication to perform migration to a partner MC system, the partner MC system being associated to the IMS.
A network element comprising:
- a processor;
- and
- a communications subsystem, wherein the network element is configured to:
- receive, from a User Equipment (UE), a message comprising at least one of an indication that the UE wishes to migrate to a partner Mission Critical (MC) system and a location of the UE;
- determine a list of Public Land Mobile Network (PLMN) identifiers, wherein each PLMN identifier identifies a PLMN associated to the partner MC system;
- and
- transmit the list of PLMN identifiers to the UE.
A non-transitory computer readable medium for storing thereon computer-executable code for execution by a processor of a network element, the instruction code when executed causing the network element to:
- receive, from a User Equipment (UE), a message comprising at least one of an indication that the UE wishes to migrate to a partner Mission Critical (MC) system and a location of the UE;
- determine a list of Public Land Mobile Network (PLMN) identifiers, wherein each PLMN identifier identifies a PLMN associated to the partner MC system;
- and
- transmit the list of PLMN identifiers to the UE.
Dependencies are inferred from the claim text.