Mobility optimization method and related apparatus

A communication method, performed by a first network device or a chip for the first network device, the communication method comprising:

• receiving a radio resource control (RRC) message from a terminal device after the terminal device accesses a third cell of the first network device, wherein the RRC message comprises connection failure information and an identifier of a first cell, and the first cell is a cell from which a reconfiguration message or a handover command message is sent to the terminal device and a handover failure occurs in a procedure in which the terminal device attempts to be handed over from the first cell of a source network device to a second cell of a target network device or the first cell is a cell in which a connection failure of the terminal device occurs;
• and
• determining the identifier of the first cell based on the RRC message, wherein
• the first cell uses a first radio access technology, the second cell and the third cell use a second radio access technology different from the first radio access technology, the connection failure information is in a form of a container in the RRC message, and the identifier of the first cell is outside the container, and wherein the following is also carried in the RRC message and also outside the container:
• type information of the first cell, wherein the type information indicates that the first cell is a long term evolution (LTE) cell, an eLTE cell, or, a new radio (NR) cell.

An apparatus, wherein the apparatus is a terminal device, or a chip or a circuit disposed in the terminal device, and the apparatus comprises at least one processor and a memory, wherein the memory stores a computer program, the computer program comprises program instructions, and when the at least one processor runs the program instructions, the apparatus is enabled to perform:

• accessing a third cell of a first network device;
• and
• sending connection failure information and an identifier of a first cell to the first network device using a radio resource control (RRC) message, wherein the first cell is a cell from which the terminal device receives a reconfiguration message or a handover command message and a handover failure occurs in a procedure in which the terminal device attempts to be handed over from the first cell of a source network device to a second cell of a target network device, or the first cell is a cell in which a connection failure of the terminal device occurs, wherein
• the first cell uses a first radio access technology, the second cell and the third cell use a second radio access technology different from the first radio access technology, the connection failure information is in a form of a container in the RRC message, and the identifier of the first cell is outside the container, and wherein the following is also carried in the RRC message and also outside the container:
• type information of the first cell, wherein the type information indicates that the first cell is a long term evolution (LTE) cell, an eLTE cell, or a new radio (NR) cell.

An apparatus, wherein the apparatus is a first network device, or a chip or a circuit disposed in the first network device, and the apparatus comprises at least one processor configured to perform:

• receiving a radio resource control (RRC) message from a terminal device after the terminal device accesses a third cell of the first network device, wherein the RRC message comprises connection failure information and an identifier of a first cell, and the first cell is a cell from which a reconfiguration message or a handover command message is sent to the terminal device and a handover failure occurs in a procedure in which the terminal device attempts to be handed over from the first cell of a source network device to a second cell of a target network device or the first cell is a cell in which a connection failure of the terminal device occurs;
• and
• determining the identifier of the first cell based on the RRC message, wherein
• the first cell uses a first radio access technology, the second cell and the third cell uses a second radio access technology different from the first radio access technology, the connection failure information is in a form of a container in the RRC message, and the identifier of the first cell is outside the container, and wherein the following is also carried in the RRC message and also outside the container:
• type information of the first cell, wherein the type information indicates that the first cell is a long term evolution (LTE) cell, an eLTE cell, or, a new radio (NR) cell.