# US 11,910,307 B2 · Systems, methods and apparatuses for 3G to volte roaming

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- Number: US 11,910,307 B2
- Document ID: US11910307B2
- Status: Granted
- Kind: B2
- Application number: 17/736,770
- Filed: 2022-05-04
- Published: 2023-11-09
- Granted: 2024-02-20
- Earliest claimed: 2022-05-04
- Applicants: Jacob Brown
- Inventors: Jacob Brown
- Web page: https://patentgrep.com/patent/US11910307B2

## CPC

- H04W 48/18: Selecting a network or a communication service
- H04L 12/14: Charging, metering or billing arrangements specially adapted for data communications, e.g. authentication, authorisation and accounting [AAA] framework
- H04L 12/1403: {Architecture for metering, charging or billing}
- H04L 65/1016: IP multimedia subsystem [IMS]
- H04L 65/1073: Registration or de-registration
- H04L 65/1104: Session initiation protocol [SIP]
- H04M 15/57: {for integrated multimedia messaging subsystem [IMS]}
- H04W 4/24: Accounting or billing
- H04W 36/0022: {for transferring data sessions between adjacent core network technologies}
- H04W 36/0066: {of control information between different types of networks in order to establish a new radio link in the target network}
- H04W 36/1446: {wherein at least one of the networks is unlicensed}
- H04W 80/10: adapted for {application} session management, e.g. SIP [Session Initiation Protocol] {(connection management H04W76/00; arrangements for session management H04L67/14)}
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- H04W 88/16: Gateway arrangements
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)

## Abstract

A 3G/LTE proxy system may enable LTE wireless communication by a UE roaming in an LTE VPMN but associated with a 3G carrier. The system may include an EPC configured to proxy as an LTE-capable HPMN for the UE as the UE is attached to a VPLMN. The system may include a 3G MSC configured to proxy as a 3G-capable VPMN for the HPMN. The system may include a translator. The translator may be configured to translate a data communication from an LTE data standard to a 3G data standard, and vice versa. The translator may be configured to translate a text communication from an LTE text standard to a 3G text standard, and vice versa. The translator may be configured to translate a voice communication from an LTE voice standard to a 3G voice standard, and vice versa.

## Claims

### Claim 1

A method, comprising:
receiving, from an internet protocol (IP) multimedia subsystem (IMS), attachment procedure initiation (API) data indicative of a request from a user equipment (UE) to attach to a visited public land mobile network (VPLMN), wherein:
the UE is configured for:
voice over long term evolution (VoLTE) wireless communication; and
third-generation (3G) wireless communication; and
the VPLMN is based on an LTE standard;
determining, based on the API data, a home public mobile network (HPMN) associated with the UE, wherein the HPMN is based on a 3G standard;
outputting notification data to a home location register (HLR) of the HPMN, wherein the notification data indicates the UE is requesting to attach to the VPLMN;
receiving, from the HLR, location update data indicative of:
subscriber data associated with the UE; and
an authentication vector for the UE;
outputting the subscriber data to an extensive markup language (XML) document management server (XDMS) associated with the IMS such that the subscriber data is associated with the UE in the XDMS; and
outputting the authentication vector to a home subscriber server (HSS) associated with the IMS.

### Claim 2 (depends on 1)

The method of claim 1, further comprising establishing an IP exchange (IPX) bearer between a mobility management entity of the VPLMN and an LTE proxy for the HPMN, and wherein communication with the HPMN occurs according to a signaling system number seven (SS7) protocol or a Diameter protocol.

### Claim 3

A method, comprising:
establishing a long-term evolution (LTE) proxy for a third-generation (3G) home public mobile network (HPMN), wherein the LTE proxy comprises an evolved packet core (EPC);
establishing a 3G proxy for an LTE visited public land mobile network (VPLMN), wherein the 3G proxy comprises a mobile switching center (MSC);
establishing a translation module communicatively coupled to the EPC and the MSC, wherein the translation module is configured to translate a communication from an LTE standard to a 3G standard and vice versa; and
translating, by the translation module:
a first LTE communication to a first 3G communication, wherein the first LTE communication is:
received by the EPC from the VPLMN; and
output by the MSC to the HPMN; or
a second 3G communication to a second LTE communication, wherein the second 3G communication is:
received by the MSC from the HPMN; and,
output by the EPC to the VPLMN.

### Claim 4 (depends on 3)

The method of claim 3, wherein the EPC comprises an internet protocol (IP) multimedia subsystem (IMS).

### Claim 5 (depends on 3)

The method of claim 3, wherein:
the EPC comprises a home subscriber server (HSS) accessible by a mobility management entity (MME) of the VPLMN; and
the HSS of the EPC proxies as an HSS for the HPMN.

### Claim 6 (depends on 3)

The method of claim 3, wherein the first LTE communication or the second LTE communication comprises an IP data packet.

### Claim 7 (depends on 3)

The method of claim 3, wherein the first LTE communication or the second LTE communication comprises a session initiation protocol (SIP).

### Claim 8 (depends on 3)

The method of claim 3, wherein the 3G proxy further comprises a proxy visitor location register (VLR) for the VPLMN.

### Claim 9 (depends on 3)

The method of claim 3, wherein the first 3G communication or the second 3G communication is communicated based on a signaling system number seven protocol (SS7).

### Claim 10 (depends on 3)

The method of claim 3, further comprising establishing a monetization clearinghouse module configured to determine billing data for a user equipment (UE) roaming in the VPLMN, wherein a home network of the UE is the HPMN.

### Claim 11 (depends on 10)

The method of claim 10, wherein the monetization clearinghouse module is further configured for clearing prepaid mobile service for the UE and postpaid mobile service for the UE.

### Claim 12 (depends on 3)

The method of claim 3, wherein the translation module is further configured to maintain an internet bearer between the HPMN and a user equipment (UE) as the UE roams to the VPLMN.

### Claim 13

A system that enables long term evolution (LTE) wireless communication by a user equipment (UE) that has a home public mobile network (HPMN) based on a third-generation (3G) wireless communication standard, the system comprising:
an evolved packet core (EPC) configured to proxy as an LTE-capable HPMN for the UE as the UE is attached to a visited land public mobile network (VPLMN);
a 3G mobile switching center (MSC) configured to proxy as a 3G-capable visited public mobile network (VPMN) for the HPMN; and
a translator configured to translate:
a data communication from an LTE data standard at the EPC to a 3G data standard at the MSC and vice versa;
a text communication from an LTE text standard at the EPC to a 3G text standard at the MSC and vice versa; and
a voice communication from an LTE voice standard at the EPC to a 3G voice standard at the MSC and vice versa.

### Claim 14 (depends on 13)

The system of claim 13, wherein the translator is further configured to establish an electronic subscriber identity module (eSIM) for the UE, wherein the eSIM enables the translator to translate an LTE communication from the UE to a 3G communication recognizable by an element of the HPMN.

### Claim 15 (depends on 14)

The system of claim 14, wherein:
the LTE communication is authorized by the VPMN via the eSIM; and
the 3G communication is authorized by the HPMN via an HPMN SIM associated with the UE.

### Claim 16 (depends on 13)

The system of claim 13, wherein:
the HPMN comprises a domain name server (DNS);
the translator comprises an internet protocol multimedia subsystem (IMS); and
the DNS stores access point name (APN) for the IMS.

### Claim 17 (depends on 13)

The system of claim 13, further comprising a communications intermediary configured to establish a signaling system seven (SS7) screening protocol between the HPMN and the translator.

### Claim 18 (depends on 13)

The system of claim 13, further comprising a communications intermediary configured to establish an inter-public land mobile network (InterPLMN) internet protocol (IP) between the VPMN and the translator.

### Claim 19 (depends on 13)

The system of claim 13, wherein the translator appears to the HPMN as a circuit-switched fallback (CSFB).

### Claim 20 (depends on 13)

The system of claim 13, wherein the data communication, the text communication, or the voice communication looks like a 3G communication to the HPMN and an LTE communication to the VPMN.