Nokia Technologies Oy

Sung Hwan Won

Alessio Casati

Devaki Chandramouli

Bruno Landais

Hannu Petri Hietalahti

Rainer Liebhart

Peter Leis

Betsy Covell

György Tamás Wolfner

Manish Bhalla

A method, apparatus, and computer program product for detecting and switching between locally available PLMNs accessible to a user equipment based on a Preferred PLMN List and a Network Slice Aware PLMN Exceptions List configured by a HPLMN. The user equipment connects to a preferred VPLMN. The user equipment determines that a particular network function is not supported by the connected preferred VPLMN. The user equipment determines that another VPLMN is required to support the particular network function. The user equipment then switches to a non-preferred VPLMN which supports the particular network function. Once the particular network function is no longer necessary for the user equipment to perform a required task, the user equipment switches back a preferred VPLMN.

Method, apparatus, and computer program product for network slice aware public land mobile network selection

User equipment and method for receiving warning messages in a non-public mobile communications network. The user equipment accepts or ignores warning messages received in the non-public mobile communications network based on a warning messages reception configuration stored in a memory of the user equipment such as a memory of the mobile equipment part of the user equipment.

User equipment and method for warning messages delivery in private networks

Methods, systems, apparatuses, and computer program products provide network function selection for user equipment via a gateway network node. In an implementation, a single-network slice selection assistance information (S-NSSAI) list is received from a user equipment (UE). Additionally, it is determined whether a network node does not support a non-access stratum node selection function for the UE. Based on a determination that the network node does not support the non-access stratum node selection function for the UE, an initial UE message configured with an information element for the S-NSSAI list is generated, and the initial UE message is caused to be transmitted to a gateway network node to select a core network function for the UE.

Network function selection for user equipment via a gateway network node

Methods and apparatus, including computer program products, are provided for handling non-integrity protected reject messages in non-public networks. In some example embodiments, there may be provided an apparatus including at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to at least: receive, from a network function in a standalone non-public network (SNPN), a reject message, wherein information in the reject message indicates that the apparatus is not allowed to access the SNPN by subscription; and add the identity of the SNPN in a list of forbidden SNPNs associated with an access via which the apparatus sent a request and subsequently received the reject message.

Method and apparatus for handling non-integrity protected reject messages in non-public networks

A method comprising: determining, by a user equipment, that a non-closed access group cell is available to the user equipment in a public land mobile network, wherein the public land mobile network is identified by a public land mobile network identity and the user equipment is only allowed to access the public land mobile network via one or more closed access group cells; displaying the public land mobile network identity to a user; receiving user input selecting the public land mobile network identity; and transmitting a registration request to the public land mobile network identified by the public land mobile network identity.

Method and apparatus for manually selecting a network

Described is an approach for managing network capabilities for a user equipment (UE). A UE can maintain subscriber data that comprises an entry index of networks for which various access modes are enabled/disabled, and a counter for each network/access mode combination. After requesting access to a network, the UE may receive a non-integrity protected rejection message that indicates the network does not allow a particular access mode. Based on the cause of access rejection, the UE can disallow the particular access mode for the network, start a timer, and increment a counter associated with the network/access mode combination. Once the timer expires, if the counter value is below a threshold the UE re-enables the particular access mode for the network, or if the counter value is at or above the threshold, the UE removes the respective entry index for the particular access mode for the network.

Methods, apparatuses, and computer program products for managing a devices network capabilities in private networks

A method, apparatus and computer program product are provided herein to provide a Protocol Data Unit (PDU) session priority parameter. For example, a method is provided that comprises identifying a need in a user equipment (UE) for establishing a new protocol data unit PDU session. The method also includes evaluating whether to establish a new PDU session and determining whether to establish a new PDU session based on a PDU session priority parameter when a maximum number of PDU sessions the UE can establish in the network is reached.

Method and apparatus for admission control of sessions based on priority

Methods, systems, apparatuses, and computer program products for providing an enforcement mechanism for the maximum number of PDU sessions per network slice in a communication system are provided. A method, system, and apparatus may receive, from a user equipment (UE), a protocol data unit (PDU) session establishment request message and Single Network Slice Selection Assistance Information (S-NSSAI) through an access network (AN). The method, system, and apparatus may cause, upon detecting that the S-NSSAI is subject to the capping number of PDU sessions per network slice, transmission of a service request message to a network slice selection function (NSSF). The service request message includes an indication indicating that the S-NSSAI is subject to a capping number of PDU sessions per network slice. The indication may cause the NSSF to increment a counter associated with PDU sessions for a network slice associated with the S-NSSAI.

Method and apparatus for enforcement of maximum number of protocol data unit sessions per network slice in a communication system

Systems, methods, apparatuses, and computer program products for steering terminals to a different network in case of a disaster. A method may include sending, to a network node of a first network, a first message including an indication that a disaster condition applies to a second network when the disaster condition applies to the second network. The method may also include sending a second message to the network node of the first network including an indication that the disaster condition no longer applies to the second network when the disaster condition no longer applies to the second network.

Steering of terminals in case of disaster

Method and apparatus for deriving a cryptographic protection to a new initial non-access stratum, NAS, message for a target network from an existing security context in an idle mode inter-system change when one or more of conditions a) to d) is met, and for deriving a mapped 5G NAS security context from a source cellular network that is an EPS security context maintained by a source MME of the EPS, in an idle mode inter-system change, when one or more of conditions 1) to 4) is met, optionally after receiving a REGISTRATION REQUEST message without integrity protection and encryption.

Method and apparatus for security context handling during inter-system change

A method, apparatus, and computer program product provide enhanced emergency services fallback procedures. The user equipment may indicate the emergency services fallback within the registration request message to a network entity, such as the access and mobility management function. Upon receiving the registration request message the emergency services fallback procedure is triggered. The user equipment receives an indication, such as via an access stratum layer and the received indication is considered, such as by the non-access stratum layer in the user equipment, as the registration response message. The user equipment is configured to respond differently upon receiving differently configured registration response rejection messages or upon expiration of a response timer.

Method, apparatus, and computer program product for expediting an emergency services initiation

Methods, apparatuses, and computer program products are provided for handling session requests for emergency services. Updated closed access group (CAG) configuration information can be provided to user equipment (UE) requesting an emergency session with a public land mobile network (PLMN), and the UE may update their CAG information or discontinue its session request. When the PLMN determines that the UE's session request to the PLMN was sent via a non-CAG cell, the PLMN may then determine if the session request is for emergency services, in which case the PLMN may decide to not clear or reject the session request, while if the PLMN determines that the session request via the non-CAG cell is for non-emergency services, then the PLMN may clear or reject the session request. When a session request is rejected by the PLMN, the UE may enter a deregistered state and conduct a search for a new PLMN.

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Flower Mound, TX, United States of America

Sung Hwan Won