Traffic offloading method and related device in roaming scenario

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).

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).