Tracking area determining method, terminal device, and core network device

A tracking area determining method, comprising:

• receiving, by a core network device, indication information sent by a terminal device, wherein the indication information comprises geographic information of a position of the terminal device, wherein the geographic information comprises at least one of latitude information, longitude information, or altitude information, and the geographic information is determined by the terminal device, wherein the indication information is sent when the position of the terminal device is beyond a range covered by a plurality of TAs indicated by second TA information, wherein the second TA information comprises a center of a circle and a radius of each of the plurality of TAS, and wherein the second TA information is TA information currently used by the terminal device, and wherein a periodicity of determining the position of the terminal device is determined based on the second TA information, and wherein the periodicity of determining the position of the terminal device is increased when a distance between the terminal device and an edge of the range increases, wherein the edge of the range is determined by the center of the circle and the radius of each of the plurality of TAs in the second TA information;
• determining, by the core network device based on the at least one of latitude information, longitude information, or altitude information comprised in the geographic information, a TA corresponding to the position of the terminal device;
• and
• in response to the geographic information, sending, by the core network device, first TA information to the terminal device, wherein the first TA information comprises the TA corresponding to the geographic information of the position of the terminal device.

A terminal device, comprising at least one processor, wherein the at least one processor is coupled to at least one memory storing programming instructions executable by the at least one processor to perform operations comprising:

• receiving broadcast information sent by an access network device, wherein the broadcast information indicates to the terminal device whether to use a user-defined TA determining manner to perform position update;
• sending indication information to a core network device, wherein the indication information comprises geographic information of a position of the terminal device, wherein the geographic information comprises at least one of latitude information, longitude information, or altitude information, and the geographic information is determined by the terminal device, wherein the sending, by the terminal device, indication information to the core network device comprises:
• sending, by the terminal device, the indication information to the core network device when the position of the terminal device is beyond a range covered by a plurality of TAs indicated by second TA information, wherein the second TA information comprises a center of a circle and a radius of each of the plurality of TAS, and wherein the second TA information is TA information currently used by the terminal device, and wherein a periodicity of determining the position of the terminal device is determined based on the second TA information, and wherein the periodicity of determining the position of the terminal device is increased when a distance between the terminal device and an edge of the range increases, wherein the edge of the range is determined by the center of the circle and the radius of each of the plurality of TAs in the second TA information;
• and
• in response to the at least one of latitude information, longitude information, or altitude information comprised in the geographic information, receiving first TA information from the core network device, wherein the first TA information comprises a TA corresponding to the geographic information of the position of the terminal device.