A method for link reconfiguration, comprising: selecting, by a terminal device, a target signal from a second signal set when a beam failure occurs, wherein the beam failure comprises that quality of a signal in a first signal set satisfies a first condition, the first condition comprises that the quality of the signal is worse than a threshold, and quality of the target signal is good enough to satisfy a second condition; determining, by the terminal device, a physical random access channel, PRACH, sequence and resource corresponding to the target signal according to associations between signals in the second signal set and PRACH sequences and resources; and sending, by the terminal device, a first request to a network device through the PRACH sequence and resource corresponding to the target signal, wherein the first request is used to notify the network device of information about the target signal selected by the terminal device; characterized in that the sending, by the terminal device, the first request to the network device through the PRACH sequence and resource corresponding to the target signal, comprises: when the target signal is associated with both the contention-based PRACH resource and the contention-free PRACH resource, sending, by the terminal device, the first request only through the contention-free PRACH resource corresponding to the target signal, by: sending the first request to the network device for the first time according to the contention-free PRACH resource; and when the terminal device does not receive a response to the first request sent for the first time from the network device in a time window, sending the first request to the network device for the second time according to the contention-free PRACH resource until a number of times for which the terminal device sends the first request to the network device reaches a first threshold, and when the number of times for which the terminal device sends the first request to the network device is greater than or equal to the first threshold, stopping, by the terminal device, transmission of the first request to the network device. selecting, by a terminal device, a target signal from a second signal set when a beam failure occurs, wherein the beam failure comprises that quality of a signal in a first signal set satisfies a first condition, the first condition comprises that the quality of the signal is worse than a threshold, and quality of the target signal is good enough to satisfy a second condition; determining, by the terminal device, a physical random access channel, PRACH, sequence and resource corresponding to the target signal according to associations between signals in the second signal set and PRACH sequences and resources; and sending, by the terminal device, a first request to a network device through the PRACH sequence and resource corresponding to the target signal, wherein the first request is used to notify the network device of information about the target signal selected by the terminal device; characterized in that the sending, by the terminal device, the first request to the network device through the PRACH sequence and resource corresponding to the target signal, comprises: when the target signal is associated with both the contention-based PRACH resource and the contention-free PRACH resource, sending, by the terminal device, the first request only through the contention-free PRACH resource corresponding to the target signal, by: sending the first request to the network device for the first time according to the contention-free PRACH resource; and when the terminal device does not receive a response to the first request sent for the first time from the network device in a time window, sending the first request to the network device for the second time according to the contention-free PRACH resource until a number of times for which the terminal device sends the first request to the network device reaches a first threshold, and when the number of times for which the terminal device sends the first request to the network device is greater than or equal to the first threshold, stopping, by the terminal device, transmission of the first request to the network device. sending the first request to the network device for the first time according to the contention-free PRACH resource; and when the terminal device does not receive a response to the first request sent for the first time from the network device in a time window, sending the first request to the network device for the second time according to the contention-free PRACH resource until a number of times for which the terminal device sends the first request to the network device reaches a first threshold, and when the number of times for which the terminal device sends the first request to the network device is greater than or equal to the first threshold, stopping, by the terminal device, transmission of the first request to the network device.