A method for a single card dual standby user equipment resides in the network and a user equipment

Example discloses a single card dual standby user equipment and method for the user equipment resides in a network, a user equipment for reducing the power consumption of the present invention. Example embodiments of the present invention comprises: when the UE circuit switched domain CS domain resides in the second generation mobile communications technology 2G / 3G third generation mobile communication network technology and PS domain Packet Switched domain resides in an LTE network, if the first UE meets a preset condition, the UE performs a routing area update procedure 2G / 3G network in the PS domain, the PS domain of the UE such that resides in 2G / 3G network; PS domain in the UE camps 2G / 3G network after closing LTE radio frequency unit. Embodiments of the present invention also discloses a user equipment, can effectively reduce power consumption, improve user experience.