A wireless communication method, comprising: sending, by a terminal device, a first message to an access network device, wherein the first message carries at least one of first capability information or first function parameter information, the first capability information is used for indicating the access network device that a maximum communication capability of the terminal device is needed to be updated into a first communication capability, and the first function parameter information is used for indicating the access network device that a function parameter of the terminal device for communication is needed to be updated into a first function parameter, or a value range of the function parameter of the terminal device for communication is needed to be updated into a first value range of the function parameter; and receiving, by the terminal device, a second message from the access network device, wherein the second message carries the function parameter or the value range of the function parameter configured for the terminal device by the access network device according to the at least one of the first capability information or the first function parameter information; wherein when the terminal device switches a present serving access network device from the access network device to another access network device, a sixth message is sent from the access network device to the another access network device, characterized in that the sixth message carries the at least one of the first capability information or the first function parameter information; wherein the sixth message further carries at least one of: a communication capability of the terminal device before the updating operation, or a value range of the function parameter of the terminal device before the updating operation. sending, by a terminal device, a first message to an access network device, wherein the first message carries at least one of first capability information or first function parameter information, the first capability information is used for indicating the access network device that a maximum communication capability of the terminal device is needed to be updated into a first communication capability, and the first function parameter information is used for indicating the access network device that a function parameter of the terminal device for communication is needed to be updated into a first function parameter, or a value range of the function parameter of the terminal device for communication is needed to be updated into a first value range of the function parameter; and receiving, by the terminal device, a second message from the access network device, wherein the second message carries the function parameter or the value range of the function parameter configured for the terminal device by the access network device according to the at least one of the first capability information or the first function parameter information; wherein when the terminal device switches a present serving access network device from the access network device to another access network device, a sixth message is sent from the access network device to the another access network device, characterized in that the sixth message carries the at least one of the first capability information or the first function parameter information; wherein the sixth message further carries at least one of: a communication capability of the terminal device before the updating operation, or a value range of the function parameter of the terminal device before the updating operation.