A basic concept of a signaling reduction solution is as follows: For a 2G/3G and an LTE/system architecture evolution (SAE, System Architecture Evolution) adjacent to each other, a routing area of the 2G/3G and a tracking area of the LTE/SAE are set as equivalent location areas. When a UE enters an access system, registration is performed according to a common registration/update procedure. The network allocates a temporary identifier and a location area identifier for the UE. When the network side supports the ISR mechanism, a location area update process is initiated if the UE enters another access system, and the network allocates the temporary identifier and the location area identifier of the new system. At this time, core network nodes that provide services for the UE in the two systems register with a home subscriber server (HSS, Home Subscriber Server), and at the same time provide services for the UE. However, when the UE moves between the two systems again, with the presence of an association relationship, the registration/update process no longer needs to be initiated, so that the objective of reducing route update signaling is achieved.

However, when the UE currently does not have a data service or data traffic is low, the UE also needs to be attached to both the 2G/3G network and the LTE network. Two radio frequencies are turned on, power consumption is large, and user experience is degraded.

Embodiments of the present invention provide a method for a single card dual standby user equipment to camp on a network and a user equipment, so as to effectively reduce power consumption of a UE and improve user experience.

A method for a single card dual standby user equipment to camp on a network in the embodiment of the present invention includes: