# US 11,115,801 B2 · Traffic offloading method and related device in roaming scenario

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- Number: US 11,115,801 B2
- Document ID: US11115801B2
- Status: Granted
- Kind: B2
- Application number: 16/804,262
- Filed: 2020-02-28
- Published: 2020-06-25
- Granted: 2021-09-07
- Earliest claimed: 2017-08-31
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Xiang Hu; Yuan Xia; Han Zhou; Quan Zhu
- Web page: https://patentgrep.com/patent/US11115801B2

## CPC

- H04W 8/082: {for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents}
- H04W 8/12: between location registers or mobility servers
- H04W 28/084: among network function virtualisation [NFV] entities; among edge computing entities, e.g. multi-access edge computing
- H04W 28/0846: {between network providers, e.g. operators (selecting a network or a communication service H04W40/18)}
- H04W 40/22: using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
- 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 12/06: Authentication
- H04W 84/045: {using private Base Stations, e.g. femto Base Stations, home Node B}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Embodiments of this application disclose an offloading method and a related device in a roaming scenario, to prevent traffic of a subscribed service of a roaming subscriber from looping back to a home location, thereby reducing inter-network traffic consumption. The method in this embodiment of this application includes: receiving, by a visited core network control plane V-CP, a first message from a home core network control plane H-CP, where the first message includes a local breakout LBO policy based on a subscribed service, and the subscribed service is a service on which local breakout needs to be performed and that is of a user; and sending, by the V-CP, the LBO policy to a visited core network user plane V-UP, so that the LBO policy is installed on the V-UP to implement local breakout processing for the subscribed service.

## Claims

### Claim 1

A traffic offloading method in a roaming scenario, comprising:
receiving, by a visited core network control plane (V-CP), a first message from a home core network control plane (H-CP), wherein the first message comprises a local breakout (LBO) policy based on a subscribed service, and the subscribed service is a service on which local breakout needs to be performed and the subscribed service is subscribed to by a user; and
sending, by the V-CP, the LBO policy to a visited core network user plane (V-UP), so that the LBO policy is installed on the V-UP to implement local breakout processing for the subscribed service; wherein:
the receiving, by the V-CP, of the first message from the H-CP comprises:
receiving, by the V-CP by using a visited session management function (V-SMF) entity, the first message sent by a home session management function (H-SMF) entity; or
receiving, by the V-CP by using a visited policy control function (V-PCF) entity, the first message sent by a home policy control function (H-PCF) entity
the method further comprises:
installing the LBO policy on the V-UP,
if the V-UP determines that a service is the subscribed service, offloading, by the V-UP, traffic of the subscribed service to a visited application server (V-AS) using the LBO policy, and
if the V-UP determines that a service is an ordinary service, distributing a service flow of a terminal to a home application server (H-AS).

### Claim 2 (depends on 1)

The method according to claim 1, wherein the method further comprises:
sending, by the V-CP, the LBO policy to the V-PCF entity by using the V-SMF entity; and
determining, by the V-CP by using the V-PCF entity, whether the LBO policy is valid.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the method further comprises:
determining, by the V-CP by using the V-PCF, whether the LBO policy is valid.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the sending, by the V-CP, the LBO policy to the V-UP comprises:
sending, by the V-CP, the LBO policy to the V-UP by using the V-SMF entity.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the sending, by the H-CP, the first message to the V-CP comprises:
sending, by the H-CP, the first message to the visited session management function (V-SMF) entity by using the home session management function (H-SMF) entity.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the sending, by the H-CP, the first message to the V-CP comprises:
sending, by the H-CP, the first message to the visited policy control function (V-PCF) entity by using the home policy control function (H-PCF) entity.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the method further comprises:
obtaining, by the H-CP, the LBO policy.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the obtaining, by the H-CP, the LBO policy comprises:
configuring, by the H-CP, the LBO policy by using a home session management function (H-SMF) entity;
receiving, by the H-CP, a second message from the home application server (H-AS), wherein the second message comprises the LBO policy; or
obtaining, by the H-CP, the LBO policy from a home policy control function (H-PCF) entity.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the first message comprises grant information of an operator at a roaming location.

### Claim 10

A traffic offloading system, comprising a home core network control plane (H-CP) and a visited core network control plane (V-CP),
the V-CP is configured to: receive a first message sent to the V-CP from the H-CP, wherein the first message comprises a local breakout (LBO) policy based on a subscribed service, and the subscribed service is a service on which local breakout needs to be performed and the subscribed service is subscribed to by a user;
the V-CP is further configured to: send the LBO policy to a visited core network user plane (V-UP), so that the LBO policy is installed on the V-UP to implement local breakout processing for the subscribed service; and
the V-CP is further configured to: receive, by using a visited session management function (V-SMF) entity, the first message sent by a home session management function (H-SMF) entity; or receive, by using a visited policy control function (V-PCF) entity, the first message sent by a home policy control function (H-PCF) entity; and
wherein the traffic offloading system is configured to:
install the LBO policy on the V-UP,
if the V-UP determines that a service is the subscribed service, offload, by the V-UP, traffic of the subscribed service to a visited application server (V-AS) using the LBO policy, and
if the V-UP determines that a service is an ordinary service, distributing a service flow of a terminal to a home application server (H-AS).

### Claim 11 (depends on 10)

The system according to claim 10, wherein the V-CP is configured to: send the LBO policy to the V-PCF entity by using the V-SMF entity; and determine, by using the V-PCF entity, whether the LBO policy is valid.

### Claim 12 (depends on 10)

The system according to claim 10, wherein the V-CP is configured to: determine, by using the V-PCF, whether the LBO policy is valid.

### Claim 13 (depends on 10)

The system according to claim 10, wherein the V-CP is configured to: send the LBO policy to the V-UP by using a visited session management function (V-SMF) entity.

### Claim 14 (depends on 10)

The system according to claim 10, wherein the V-CP is configured to: send the first message to the visited session management function (V-SMF) entity by using the home session management function (H-SMF) entity.

### Claim 15 (depends on 10)

The system according to claim 10, wherein the H-CP is configured to: send the first message to the visited policy control function (V-PCF) entity by using the home policy control function (H-PCF) entity.

### Claim 16 (depends on 10)

The system according to claim 10, wherein the H-CP is configured to: obtain the LBO policy.

### Claim 17

A visited core network control plane (V-CP), the V-CP comprises:
at least one processor, and a memory storing computer-executable instructions;
wherein the computer-executable instructions, when executed by the at least one processor, further cause the V-CP to:
receive a first message from a home core network control plane (H-CP), wherein the first message comprises a local breakout (LBO) policy based on a subscribed service, and the subscribed service is a service on which local breakout needs to be performed and the subscribed service is subscribed to by a user;
send the LBO policy to a visited core network user plane (V-UP), so that the LBO policy is installed on the V-UP to implement local breakout processing for the subscribed service; and
receive, by using a visited session management function (V-SMF) entity, the first message from a home session management function (H-SMF) entity; or receive, by using a visited policy control function (V-PCF) entity, the first message from a home policy control function (H-PCF) entity;
wherein the LBO policy sent from the V-CP is installed on the V-UP so that upon determination that a service is the subscribed service, traffic of the subscribed service is offloaded by the V-UP to a visited application server (V-AS) using the LBO policy sent from the V-CP, and upon determination that a service is an ordinary service, a service flow of a terminal is distributed to a home application server (H-AS).