Disabling n1 mode upon receiving a 5gmm cause value message

Abstract

A method includes a user equipment (UE) transmitting a first message to a network node, the first message including a request to access a first network according to a Non-Access Layer (NAS) protocol. The UE receives a second message from the network node, the second message including an indication that no network slice is available to serve the UE's requested access to the first network. Based on the receipt of the second message, the UE disables its ability to access the network using the NAS protocol, stores an identification code of the first network, and subsequently utilizes the stored identification code of the first network during a network selection process.

Claims

1. A method for communication, comprising: transmitting a registration request message by a user equipment (UE) to a network node, the network node including an Access and Mobility Function (AMF), and the registration request message including a request for access to a first network according to a Non-Access Layer (NAS) protocol and a request for one or more Single Network Slice Selection Assist Information (S-NSSAI); receiving a registration rejection message from the network node by the UE, the registration rejection message including an indication that no network slice is available to serve the UE's requested access to the first network; disabling the ability of the UE to access the network using the NAS protocol based on the receipt of the registration rejection message, wherein disabling the ability to access the network using the NAS protocol includes disabling an N1 mode capability; storing an identification code of the first network by the UE; and, after storage, using the stored identification code of the first network by the UE during a network selection process. The indication that no network slice is available is a 5G system mobility management (5GMM) cause value 62 (#62) "No network slice available" indication; the registration rejection message includes the reason "S-NSSAI is unavailable in the current PLMN or SNPN" as the reason for no network slice available; the method further includes: the user equipment deleting the stored identifier of the first network based on the occurrence of a first event, the first event including the user equipment receiving a third message from the network node, the third message including an indication that a network slice subscription has been changed.

2. As in request item 1, where, The third message is a registration acceptance message, which contains a network slice instruction information element (IE) including a network slice subscription change instruction set to "network slice subscription change".

3. The method of any one of claims 1 to 2 further includes: the user equipment abandoning the first network during the network selection process.

4. As in request item 1, where, The third message includes an instruction indicating that registration with the first network is available for use by the user's equipment.

5. As in request item 1, where, The stored identifier is associated with one of the entries in a user profile list.

6. A user equipment (UE) comprising: at least one processor; and at least one memory storing instructions, which, when executed by the at least one processor, cause the user equipment to perform at least one of the methods claimed in claims 1 to 5.

7. A processor-readable medium storing instructions that, when executed by at least one processor of a device, cause the device to perform at least any one of claims 1 to 5.

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