主权项 |
1. A method comprising:
camping, by a wireless device, on a current cell of a base station of a wireless network; receiving, by the wireless device and from the base station, access class barring information including a first barring parameter and a second barring parameter pertaining to the current cell; storing, by the wireless device, the first barring parameter and the second barring parameter; receiving, by the wireless device and subsequent to the storing, an input to initiate an emergency call; determining, by the wireless device and in response to the input, whether the emergency call can be established via the current cell based on a value of the first barring parameter; selecting, by the wireless device, one or more values of the second barring parameter in response to determining that the value of the first barring parameter indicates that the emergency call cannot be established via the current cell; cell searching and synchronizing, by the wireless device, for a first candidate cell based on the one or more values of the second barring parameter; receiving, by the wireless device, based on the cell searching and synchronizing, system information from the first candidate cell, wherein the system information includes a first barring parameter pertaining to the first candidate cell; determining, by the wireless device, whether the emergency call can be established via the first candidate cell based on the one or more values of the second barring parameter and the system information; and establishing, by the wireless device, the emergency call via the first candidate cell based on determining that the emergency call can be established via the first candidate cell. |