Method for obtaining radio capability information of terminal, core network entity, base station, and terminal

A method for obtaining radio capability information of a terminal, wherein the method comprises:

• determining, by a mobility management entity (MME), that a first terminal has changed its access to a network from a first communication path to a second communication path, wherein the first terminal directly accesses the network in the first communication path, and accesses the network indirectly thorough a second terminal in the second communication path, the second terminal having a higher radio capability than the first terminal;
• sending, by the MME, a first message to a base station of the network, wherein the first message is configured for triggering the base station to obtain radio capability information of the first terminal from the first terminal;
• and
• receiving, by the MME, a second message sent by the base station, wherein the second message comprises the radio capability information of the first terminal, and the radio capability information of the first terminal comprises information about a manner of a connection between the first terminal and the second terminal and,
• identification information of the second terminal, or
• radio capability information of the second terminal,
• wherein before sending, by the MME, the first message to the base station, the method further comprises:
• receiving, by the MME, a third message sent by the first terminal, wherein the third message comprises capability update indication information and access path indication information of the first terminal;
• and, wherein the determination by the MME that first terminal has changed its access to the network from the first communication path to the second communication path is based on the third message.

A terminal comprising:

• a processor configured to:
• directly access a network via a first communication path;
• and
• switch the access to the network from the first communication to a second communication path, wherein in the second communication path, the terminal is configured to access the network through a second terminal, second terminal having a higher radio capability than the terminal;
• a receiver, configured to receive a first message sent by a base station, wherein the first message is configured for the base station to obtain radio capability information of the terminal;
• and
• a transmitter, configured to in response to the first message, send the radio capability information of the first terminal to the base station, wherein the radio capability information of the first terminal comprises information about a manner of a connection between the first terminal and the second terminal and,
• identification information of the second terminal, or
• radio capability information of the second terminal,
• wherein before the receiver receives the first message sent by the base station, the transmitter is further configured to send a second message to a mobility management entity (MME), wherein the second message comprises capability update indication information and access path indication information of the first terminal, so that the MME is enabled to:
• determine, based on the update indication information of the first terminal, that a network access manner of the first terminal has changed,
• send a third message to the base station, and
• determine, based on the access path indication information of the first terminal, that the first terminal has changed its access to the network from the first communication path to the second communication path.