IMS voice support in networks using EPS fallback and having 4G coverage holes

A method is provided. The method may be performed by a UE. The method includes attempting to attach to the EPS network or performing a tracking area update for a number of times in the EPS network to obtain the voice service. The method includes starting a modified timer based on failure to attach to the EPS network or performing a tracking area update in the EPS network for the number of times and based on the configuration parameters. The modified timer may be modified based on a default timer. The method includes keeping S1 mode enabled when the modified timer is started. The method includes attempting to obtain a voice service based on one or more access technologies other than the EPS. The method includes attaching to the EPS network or performing a tracking area update in the EPS network based on the modified timer to obtain the voice service. 提供了一种方法。该方法可以由UE执行。该方法包括：尝试附接到EPS网络或者在EPS网络中执行跟踪区域更新达一次数以获得语音服务。该方法包括：基于未能附接到EPS网络或者在EPS网络中执行跟踪区域更新达所述次数并且基于配置参数来启动经修改的定时器。经修改的定时器可以是基于默认定时器而被修改的。该方法包括：在启动经修改的定时器