Mobility management method, user equipment, storage node, and base station

A context storage node, wherein the context storage node comprises:

• an input unit, an output unit, a memory, and a processor;
• the memory is configured to store program code, and the processor is configured to invoke the program code stored by the memory to perform the following steps:
• receiving, by the input unit, a connection context of user equipment (UE) in a connected state that is sent by a first base station;
• determining that the UE is in a low consumption state, and storing the connection context, wherein in the low consumption state, the UE stores the connection context and performs cell camping based on a cell reselection criterion in a moving process;
• and
• sending a path switching request to a core network device, by the output unit, so that the core network device switches a core network interface related to the UE to the context storage node,
• wherein the preset activation condition comprises at least one or a combination of the following conditions:
• the first base station sends the UE a control instruction used to instruct the UE to enter the low consumption state;
• no data transmission is performed between the first base station and the UE in a first preset duration;
• the first base station determines that a timing advance timer (TA timer) of the UE expires, or the first base station determines that the TA timer of the UE expires and the TA timer does not rerun in a second preset duration;
• and
• the first base station determines that the UE does not exit, after entering a discontinuous reception (DRX) state, the DRX state being in a third preset duration.

A user equipment (UE), wherein the UE comprises:

• an output unit, a memory, and a processor;
• the memory is configured to store program code, and the processor is configured to invoke the program code stored by the memory to perform the following steps:
• determining a source identifier of the UE in a connected state in a first cell, wherein the source identifier is used to identify the UE;
• allowing the UE to enter a low consumption state when a preset activation condition is met, wherein in the low consumption state, the UE stores a connection context of the UE in the connected state and performs cell camping based on a cell reselection criterion in a moving process;
• and
• reporting, by the output unit when a first preset condition is met, the source identifier to a second base station to which a second cell belongs, wherein the second cell is a serving cell on which the UE currently camps,
• wherein the base station to which the first cell belongs is the first base station;
• and the preset activation condition comprises at least one of the following conditions:
• the UE receives a control instruction that is sent by the first base station and that instructs to enter the low consumption state;
• the UE leaves the first cell;
• no data transmission is performed between the UE and the first base station in a first preset duration;
• a timing advance timer (TA timer) of the UE expires, or the TA timer of the UE expires and the TA timer does not rerun in a second preset duration;
• and
• after entering a discontinuous reception (DRX) state, the UE does not exit the DRX state in a third preset duration.