# US 12,010,615 B2 · Mobile device context transfer in a 5G system

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- Number: US 12,010,615 B2
- Document ID: US12010615B2
- Status: Granted
- Kind: B2
- Application number: 17/283,337
- Filed: 2019-10-08
- Published: 2022-01-06
- Granted: 2024-06-11
- Earliest claimed: 2018-10-08
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Alexandre S. Stojanovski; Robert Zaus
- Web page: https://patentgrep.com/patent/US12010615B2

## CPC

- H04W 48/20: Selecting an access point
- H04W 8/02: Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W 8/20: Transfer of user or subscriber data
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 60/005: {Multiple registrations, e.g. multihoming}
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W 88/18: Service support devices; Network management devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

An apparatus of an Access and Mobility Function (AMF) comprises one or more baseband processors to process a request from a new AMF for a user equipment (UE) context transfer for a UE registered to the AMF via a first access type, wherein UE context transfer request includes an indication of a second access type for the UE to register with the new AMF, and to determine whether an entire UE context should be returned to the new AMF based on the second access type. The apparatus can include a memory to store the request.

## Claims

### Claim 1

One or more processors of an Access and Mobility Function (AMF) configured to perform operations comprising:
receiving a request from a new AMF for a user equipment (UE) context transfer for a UE registered to the AMF with a first access type, wherein the request includes an indication of a second access type for the UE to register with the new AMF;
determining that an interface cannot be relocated to the new AMF; and
returning to the new AMF a subscription permanent identifier (SUPI) of the UE and an indication that a registration request procedure is validated for integrity protection without including an entire UE context in response to determining that the interface cannot be relocated to the new AMF.

### Claim 2 (depends on 1)

The one or more processors of claim 1, wherein the first access type and the second access type are any type of a non-3GPP access or a 3GPP access.

### Claim 3 (depends on 1)

The one or more processors of claim 1, the operations further comprising:
determining whether the entire UE context should be returned to the new AlVIF if the first access type is non-3GPP access and the second access type is 3GPP access.

### Claim 4 (depends on 1)

The one or more processors of claim 1, the operations further comprising:
determining whether the entire UE context should be returned to the new AMF based on a Public Land Mobile Network (PLMN) identity of the new AMF.

### Claim 5 (depends on 1)

The one or more processors of claim 1, wherein the one or more processors are to the operations further comprising: send a rejection of the UE context transfer request with an appropriate cause when it is determined to not return the entire UE context.

### Claim 6

One or more processors of an Access and Mobility Function (AMF) configured to perform operations, the operations comprising:
receiving a registration request from a user equipment (UE) registered to an old AMF with a first access type;
sending a request to the old AMF for a UE context transfer, wherein the UE context transfer request includes an indication of a second access type for the UE with which to register with the AMF; and
receiving from the old AMF a subscription permanent identifier (SUPI) of the UE and an indication that a registration request procedure is validated for integrity protection without including an entire UE context.

### Claim 7 (depends on 6)

The one or more processors of claim 6, wherein the first access type and the second access type is any type of a non-3GPP access or a 3GPP access.

### Claim 8 (depends on 6)

The one or more processors of claim 6, wherein the registration request includes a native temporary identifier for the UE that is associated with a Public Land Mobile Network (PLMN) of the old AMF.

### Claim 9 (depends on 6)

The one or more processors of claim 6, the operations further comprising sending a rejection of the UE context transfer request with an appropriate cause.

### Claim 10

A method of an Access and Mobility Function (AMF) comprising:
receiving a request from a new AMF for a user equipment (UE) context transfer for a UE registered to the AMF a first access type, wherein the request includes an indication of a second access type for the UE via which to register with the new AMF;
determining that an interface cannot be relocated to the new AMF; and
returning to the new AMF a subscription permanent identifier (SUPI) of the UE and an indication that a registration request procedure is validated for integrity protection without including an entire UE context in response to determining that the interface cannot be relocated to the new AMF.

### Claim 11 (depends on 10)

The method of claim 10, wherein the first access type and the second access type is any type of a non-3GPP access or a 3GPP access.

### Claim 12 (depends on 10)

The method of claim 10 further comprising:
determining whether the entire UE context should be returned to the new AMF if the first access type is non-3GPP access and the second access type is 3GPP access.

### Claim 13 (depends on 10)

The method of claim 10 further comprising:
determining whether the entire UE context should be returned to the new AMF based on a Public Land Mobile Network (PLMN) identity of the new AMF.

### Claim 14 (depends on 10)

The method of claim 10 further comprising:
sending a rejection of the UE context transfer request with an appropriate cause when it is determined to not return the entire UE context.

### Claim 15

A method of an Access and Mobility Function (AMF) configured to perform operations comprising:
receiving a registration request from a user equipment (UE) registered to an old AMF via a first access type;
sending a request to the old AMF for a UE context transfer, wherein the UE context transfer request includes an indication of a second access type for the UE with which to register with the AMF; and
receiving from the old AMF a subscription permanent identifier (SUPI) of the UE and an indication that a registration request procedure is validated for integrity protection without including an entire UE context.

### Claim 16 (depends on 15)

The method of claim 15, wherein the first access type and the second access type is any type of a non-3GPP access or a 3GPP access.