Packet transmission method, communication apparatus, and communication system

A communication apparatus, wherein the communication apparatus is a source transport layer proxy network element or is a chip for the source transport layer proxy network element, and wherein the communication apparatus comprises a processor, wherein the processor is coupled to a memory, and the memory is configured to store a program or instructions;

• and when the program or the instructions is/are executed by the processor, the apparatus is enabled to perform operations comprising:
• based on receiving third indication information, stopping performing transport layer processing on a packet on a first path based on a first context of the source transport layer proxy network element, wherein the first context is a context about packet transmission of the source transport layer proxy network element on the first path, wherein
• the first context is used by a target transport layer proxy network element to establish a fourth transport layer connection;
• based on receiving first indication information, the target transport layer proxy network element performs transport layer processing on a packet on a second path based on a second context of the target transport layer proxy network element;
• the second context is determined based on the first context and a context of the fourth transport layer connection;
• the first indication information is used to indicate that application context migration between a first application server and a second application server is completed;
• when the application context migration is being performed, packet transmission between the first application server and a proxy network element is stopped;
• and the proxy network element comprises the source transport layer proxy network element or the target transport layer proxy network element;
• and
• the first path is a path established between a terminal device and the first application server, the first path comprises a first transport layer connection and a second transport layer connection, the first transport layer connection is a transport layer connection between the source transport layer proxy network element and the terminal device, the second transport layer connection is a transport layer connection between the source transport layer proxy network element and the first application server, the second path comprises a third transport layer connection and the fourth transport layer connection, the third transport layer connection is a transport layer connection between the target transport layer proxy network element and the terminal device, and the fourth transport layer connection is a transport layer connection between the target transport layer proxy network element and the second application server.

A packet transmission method, comprising:

• based on a source transport layer proxy network element receiving third indication information, stopping performing, by the source transport layer proxy network element, transport layer processing on a packet on a first path based on a first context of the source transport layer proxy network element, wherein the first context is a context about packet transmission of the source transport layer proxy network element on the first path;
• establishing, by a target transport layer proxy network element, a fourth transport layer connection based on the first context;
• and
• based on the target transport layer proxy network element receiving first indication information, and the first indication information being used to indicate that application context migration between a first application server and a second application server is completed, performing, by the target transport layer proxy network element, transport layer processing on a packet on a second path based on a second context of the target transport layer proxy network element, and transmitting, on the second path, a packet obtained through the transport layer processing, wherein the second path comprises a third transport layer connection and the fourth transport layer connection;
• the second context is determined based on the first context and a context of the fourth transport layer connection;
• when the application context migration is being performed, packet transmission between the first application server and a transport layer proxy network element is stopped;
• and the transport layer proxy network element comprises the source transport layer proxy network element or the target transport layer proxy network element, wherein the first path is a path established between a terminal device and the first application server,
• the first path comprises a first transport layer connection and a second transport layer connection, the first transport layer connection is a transport layer connection between the source transport layer proxy network element and the terminal device, the second transport layer connection is a transport layer connection between the source transport layer proxy network element and the first application server, the third transport layer connection is a transport layer connection between the target transport layer proxy network element and the terminal device, and the fourth transport layer connection is a transport layer connection between the target transport layer proxy network element and the second application server.

A communication system, wherein the communication system comprises a source transport layer proxy network device and a target transport layer proxy network device, wherein the source transport layer proxy network device is a hardware device including a processor and the target transport layer proxy network device is a hardware device including a processor, wherein

• the source transport layer proxy network device is configured to:
• based on receiving third indication information, stop performing transport layer processing on a packet on a first path based on a first context of the source transport layer proxy network device, wherein the first context is a context about packet transmission of the source transport layer proxy network device on the first path;
• and
• the target transport layer proxy network device is configured to:
• establish a fourth transport layer connection based on the first context;
• based on first indication information being received, and the first indication information being used to indicate that application context migration between a first application server and a second application server is completed, perform transport layer processing on a packet on a second path based on a second context of the target transport layer proxy network device;
• and transmit, on the second path, a packet obtained through the transport layer processing, wherein the second path comprises a third transport layer connection and the fourth transport layer connection;
• the second context is determined based on the first context and the fourth transport layer connection;
• when the application context migration is being performed, packet transmission between the first application server and a transport layer proxy network device is stopped;
• and the transport layer proxy network device comprises the source transport layer proxy network device or the target transport layer proxy network device, wherein
• the first path is a path established between a terminal device and the first application server, the first path comprises a first transport layer connection and a second transport layer connection, the first transport layer connection is a transport layer connection between the source transport layer proxy network device and the terminal device, the second transport layer connection is a transport layer connection between the source transport layer proxy network device and the first application server, the third transport layer connection is a transport layer connection between the target transport layer proxy network device and the terminal device, and the fourth transport layer connection is a transport layer connection between the target transport layer proxy network device and the second application server.