Method for Implementing Soft Handover Based on Carrier Aggregation Technology, Base Station, and Terminal

A base station, applied in a scenario of complementary carrier coverage, comprising:

• an interaction module, configured to:
• simultaneously receive and transmit data through a plurality of cells corresponding to a plurality of member carriers by means of carrier aggregation with a terminal, wherein one of the plurality of cells is a primary cell, and the rest cells are secondary cells;
• a handover decision module, configured to:
• according to a measurement result of the terminal, determine to switch one of the secondary cells to be the primary cell of the terminal, and mark the one of the secondary cells as a target secondary cell;
• and
• a handover control module, configured to:
• maintain a service connection between the terminal and the target secondary cell, and notify the terminal to hand over a control signaling connection to the target secondary cell.

A terminal, applied in a scenario of complementary carrier coverage, comprising:

• an interaction module, configured to:
• simultaneously receive and transmit data through a plurality of cells corresponding to a plurality of member carriers by means of carrier aggregation with a base station, wherein one of the plurality of cells is a primary cell, and the rest cells are secondary cells;
• a measurement result report module, configured to:
• when signal strength of the primary cell and signal strength of a certain secondary cell meet a handover condition, report a measurement result of signals of the primary cell and the secondary cell to the base station, wherein the measurement result of the signals contains the signal strength of the primary cell and the signal strength of the secondary cell;
• and
• a handover control module, configured to:
• after receiving a signaling message of handing over a control signaling connection to a target secondary cell from the base station, maintain a service connection with the target secondary cell, and establish a control signaling link with the target secondary cell.