A timer-based processing method performed by a terminal device, the method comprising: obtaining a first timer corresponding to a source network device, the first timer being configured through radio resource control, RRC, signaling from a network side; and characterized by further comprising: maintaining a connection between the terminal device and the source network device and monitoring the connection between the terminal device and the source network device based on the first timer corresponding to the source network device, in response to the terminal device connecting to a target network device; during monitoring the source network device based on the first timer of the source network device: starting the first timer corresponding to the source network device in response to a starting condition of the first timer being met; stopping the first timer corresponding to the source network device in response to a stopping condition of the first timer being met, or upon expiry of a timing time of the first timer, wherein the first timer comprises an adjusted T310, and wherein a stopping condition of the adjusted T310 comprises at least one of: successive reception of physical-layer synchronous indications; or trigger of a connection re-establishment procedure, and wherein the stopping condition of the adjusted T310 does not comprise: reception of a handover, HO, command. obtaining a first timer corresponding to a source network device, the first timer being configured through radio resource control, RRC, signaling from a network side; and characterized by further comprising: maintaining a connection between the terminal device and the source network device and monitoring the connection between the terminal device and the source network device based on the first timer corresponding to the source network device, in response to the terminal device connecting to a target network device; during monitoring the source network device based on the first timer of the source network device: starting the first timer corresponding to the source network device in response to a starting condition of the first timer being met; stopping the first timer corresponding to the source network device in response to a stopping condition of the first timer being met, or upon expiry of a timing time of the first timer, wherein the first timer comprises an adjusted T310, and wherein a stopping condition of the adjusted T310 comprises at least one of: successive reception of physical-layer synchronous indications; or trigger of a connection re-establishment procedure, and wherein the stopping condition of the adjusted T310 does not comprise: reception of a handover, HO, command. maintaining a connection between the terminal device and the source network device and monitoring the connection between the terminal device and the source network device based on the first timer corresponding to the source network device, in response to the terminal device connecting to a target network device; during monitoring the source network device based on the first timer of the source network device: starting the first timer corresponding to the source network device in response to a starting condition of the first timer being met; stopping the first timer corresponding to the source network device in response to a stopping condition of the first timer being met, or upon expiry of a timing time of the first timer, starting the first timer corresponding to the source network device in response to a starting condition of the first timer being met; stopping the first timer corresponding to the source network device in response to a stopping condition of the first timer being met, or upon expiry of a timing time of the first timer, wherein the first timer comprises an adjusted T310, and wherein a stopping condition of the adjusted T310 comprises at least one of: successive reception of physical-layer synchronous indications; or trigger of a connection re-establishment procedure, and successive reception of physical-layer synchronous indications; or trigger of a connection re-establishment procedure, and wherein the stopping condition of the adjusted T310 does not comprise: reception of a handover, HO, command.