Access class barring and redirecting of emergency calls

摘要

A method, a device, and a non-transitory storage medium having instructions to store a first access class barring parameter and a second access class barring parameter pertaining to emergency calls via a cell on which a wireless device is camped; receive an indication that an emergency call is to be established; select one or more values of the second barring parameter in response to a determination that a value of the first barring parameter indicates that the emergency call cannot be established via the cell; select a first candidate cell based on the one or more values of the second barring parameter; and determine 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 system information pertaining to the first candidate cell.

主权项

1. A method comprising:
camping, by a wireless device, on a current cell of a base station of a wireless network, wherein the wireless network is a Long Term Evolution 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 via a system information block type 2 message; 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, wherein the one or more values of the second barring parameter include an Evolved Absolute Radio Frequency Channel Number value pertaining to a first candidate cell; cell searching and synchronizing, by the wireless device, for the first candidate cell based on the one or more values of the second barring parameter, wherein the current cell and the first candidate cell are serviced by a same evolved Node B corresponding to the base station; 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; 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; determining, by the wireless device, whether another one or more values of the second barring parameter are stored based on determining that the emergency call cannot be established via the first candidate cell; selecting, by the wireless device, the other one or more values of the second barring parameter based on determining that the other one or more values of the second barring parameter are stored; and cell searching and synchronizing, by the wireless device, for a second candidate cell based on the other one or more values of the second barring parameter.