Method for configuring a frequency priority, terminal device, base station, and core network device

A base station, comprising:

• a transceiver, used for transmitting a first request message to a core network device, wherein the first request message is used for requesting information of a network slice registered by a terminal device, and a frequency corresponding to the network slice registered by the terminal device is a frequency at which the terminal device preferentially resides;
• and
• used for receiving a response message transmitted by the core network device for the first request message, wherein the response message comprises the information of the network slice registered by the terminal device;
• and
• a processor, used for configuring information of a frequency priority for the terminal device according to the response message, wherein the information of the frequency priority indicates information of an order of frequencies at which the terminal device is able to reside and which are sorted according to a priority,
• wherein the transceiver is further used for transmitting the configured information of the frequency priority to the terminal device,
• wherein before the transceiver transmits the request message to the core network device, the processor is further used for determining that the terminal device is about to enter an idle state or an inactive state from a connected state,
• wherein the processor is further used for configuring information of a frequency priority in a tracking area (TA), or information of a frequency priority in a TA list, or information of a frequency priority in a radio access network (RAN) Notification Area for the terminal device according to the response message when the terminal device is about to enter the inactive state from the connected state, and
• wherein an effective range of the information of the frequency priority in a TA is within the TA, an effective range of the information of the frequency priority in a TA list is within all TAs in the TA list, and an effective range of the information of the frequency priority in a RAN Notification Area is within the RAN notification area.

A terminal device, comprising:

• a transceiver, used for receiving information of a frequency priority transmitted by a base station, wherein the information of the frequency priority is determined according to information of a network slice registered by the terminal device and a state that the terminal device is about to enter from a connected state, wherein the information of the frequency priority indicates information of an order of frequencies at which the terminal device is able to reside and which are sorted according to a priority, and the state that the terminal device is about to enter from the connected state comprises an idle state or an inactive state;
• and
• a processor, used for selecting a frequency to reside at according to the information of the frequency priority when re-entering the connected state from the idle state or the inactive state;
• wherein if the idle state is about to be entered from the connected state, the information of the frequency priority comprises information of a frequency priority in a tracking area (TA) or information of a frequency priority in a TA list;
• or
• wherein if the inactive state is about to be entered from the connected state, the information of the frequency priority comprises information of a frequency priority in a TA, or information of a frequency priority in a TA list, or information of a frequency priority in a radio access network (RAN) notification area.