Method and apparatus for registering to IMS network, terminal, and readable storage medium

A terminal, comprising:

• a processor, a memory, and a program or an instruction stored in the memory and executable on the processor, wherein the program or the instruction, when executed by the processor, causes the terminal to perform:
• transmitting first network registration signaling to a current camped cell;
• receiving second signaling transmitted by the current camped cell in response to the first network registration signaling;
• and
• in a case that the second signaling comprises indication information indicating that registration to the IMS network is not supported, performing one of the following:
• performing a cell handover operation;
• or
• displaying first prompt information, wherein the first prompt information is used to prompt a user to move the terminal to another location to attempt registration to the IMS network;
• wherein when performing a cell handover operation, the program or the instruction, when executed by the processor, causes the terminal to perform:
• a determining step:
• determining a target cell from neighboring cells of the current camped cell of the terminal, and reporting a measurement report to a network side, wherein the measurement report is used for the network side to hand over the terminal from the current camped cell to the target cell;
• a transmitting and receiving step:
• after the terminal is handed over to the target cell, transmitting first network registration signaling to the current camped cell, and receiving second signaling transmitted by the target cell in response to the first network registration signaling;
• and
• in a case that the second signaling comprises indication information indicating that registration to the IMS network is supported, performing registration to the IMS network;
• or
• in a case that the second signaling comprises indication information indicating that registration to the IMS network is not supported, repeating the determining step and the transmitting and receiving step until the received second signaling comprises indication information indicating that registration to the IMS network is supported or a quantity of cell handovers reaches a preset threshold.

A non-transitory readable storage medium, wherein the non-transitory readable storage medium stores a program or an instruction, wherein the program or the instruction, when executed by a processor of a terminal, causes the terminal to perform:

• transmitting first network registration signaling to a current camped cell;
• receiving second signaling transmitted by the current camped cell in response to the first network registration signaling;
• and
• in a case that the second signaling comprises indication information indicating that registration to the IMS network is not supported, performing one of the following:
• performing a cell handover operation;
• or
• displaying first prompt information, wherein the first prompt information is used to prompt a user to move the terminal to another location to attempt registration to the IMS network;
• wherein when performing a cell handover operation, the program or the instruction, when executed by the processor of the terminal, causes the terminal to perform:
• a determining step:
• determining a target cell from neighboring cells of the current camped cell of the terminal, and reporting a measurement report to a network side, wherein the measurement report is used for the network side to hand over the terminal from the current camped cell to the target cell;
• a transmitting and receiving step:
• after the terminal is handed over to the target cell, transmitting first network registration signaling to the current camped cell, and receiving second signaling transmitted by the target cell in response to the first network registration signaling;
• and
• in a case that the second signaling comprises indication information indicating that registration to the IMS network is supported, performing registration to the IMS network;
• or
• in a case that the second signaling comprises indication information indicating that registration to the IMS network is not supported, repeating the determining step and the transmitting and receiving step until the received second signaling comprises indication information indicating that registration to the IMS network is supported or a quantity of cell handovers reaches a preset threshold.