# US 11,122,417 B2 · Support for manual roaming for volte

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- Number: US 11,122,417 B2
- Document ID: US11122417B2
- Status: Granted
- Kind: B2
- Application number: 16/759,409
- Filed: 2018-10-29
- Published: 2020-10-15
- Granted: 2021-09-14
- Earliest claimed: 2017-10-30
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: George Foti; Shabnam Sultana; Juying Gan
- Web page: https://patentgrep.com/patent/US11122417B2

## CPC

- H04W 8/12: between location registers or mobility servers
- H04W 8/18: Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
- H04L 65/1016: IP multimedia subsystem [IMS]
- 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)

## Abstract

Methods and systems providing support for manual roaming in a telecommunications network are provided. According to one aspect, a method for manual roaming implemented in a Mobility Management Entity (MME) comprises: receiving, from a User Equipment (UE) a request to access the telecommunications network, the request comprising an indication that Local Operator Services, LOS, are desired; determining that authentication information for authenticating the UE is unavailable; and, in response to determining that the authentication information is unavailable, routing the UE to a portal for acquiring manual roaming access to the telecommunications network. If the user of the UE acquires (e.g., purchases) manual roaming access, the MME will receive an indication of such from the portal and grant the UE access. The UE may be restricted to accessing only a subset of LOS services. The UE may be directed to a special Access Point Name (APN) configured for manual roamers.

## Claims

### Claim 1

A method for manual roaming in a telecommunications network, the method comprising:
at a User Equipment, UE:
sending, to a Proxy Call/Session Control Function, P-CSCF, in the telecommunications network, a request for establishing a session to access the telecommunications network, the request comprising an indication that the UE supports Restricted Local Operator Services, RLOS;
at the P-CSCF:
receiving from the UE, the request for establishing the session;
in response to determining that the UE is not authenticated, sending the request to a Serving Call/Session Control Function, S-CSCF, to indicate that the UE is a RLOS user;
in response to determining that the UE is authenticated, sending the request to the S-CSCF to indicate that the UE is a Local Operator Service, LOS, user;
at the S-CSCF:
receiving the request from the P-CSCF;
determining whether the request is for RLOS or LOS;
in response to determining that the request is for RLOS, creating a record for the UE and a default profile allowing the UE to only make calls; and
in response to determining that the request is for LOS, creating the default profile allowing the UE to make and receive calls; and
at the UE:
performing one of the following actions:
establishing an Internet Protocol, IP, Multimedia Subsystem, IMS, session based on the default profile created by the S-CSCF to thereby only make calls if the UE is determined to be the RLOS user; and
establishing an IMS session with a selected CSCF determined by the P-CSCF to thereby make and receive calls if the UE is determined to be the LOS user.

### Claim 2 (depends on 1)

The method of claim 1 wherein the request sent from the UE to the P-CSCF comprises a Session Initiation Protocol, SIP, REGISTER message.

### Claim 3

A method for manual roaming in a telecommunications network, the method comprising:
at a Proxy Call/Session Control Function, P-CSCF:
receiving from a User Equipment, UE, a Session Initiation Protocol, SIP, INVITE message for establishing a session;
in response to determining that the UE is not authenticated, sending a request to a Serving Call/Session Control Function, S-CSCF, to indicate that the UE is a Restricted Local Operator Service, RLOS, user;
in response to determining that the UE is authenticated, sending the request to the S-CSCF to indicate that the UE is a Local Operator Service, LOS, user; and
at the S-CSCF:
receiving the request from the P-CSCF;
determining whether the request is for RLOS or LOS;
in response to determining that the request is for RLOS, creating a record for the UE and a default profile allowing the UE to only make calls; and
in response to determining that the request is for LOS, creating the default profile allowing the UE to make and receive calls.

### Claim 4 (depends on 3)

The method of claim 3 wherein the request comprises a SIP REGISTER message or a SIP INVITE message.