Handover method and device in ultra-dense network

A handover device, comprising:

• a transceiver, the transceiver configured to:
• send a first message to a target base station, wherein the first message carries an arrival time indication of a terminal, and wherein the arrival time indication is used to indicate a time at which or a time range in which the terminal is to access the target base station;
• and
• receive a second message fed back by the target base station, wherein the second message carries a granted resource that is allocated for the arrival time indication of the terminal;
• and
• at least one processor, the at least one processor configured to:
• add the granted resource to a command message;
• and
• send the command message to the terminal by using the transceiver wherein the second message and the command message further carry a maximum quantity of transmission times that is configured for the granted resource by the target base station, and wherein a value of the maximum quantity of transmission times is set to 1.

User equipment comprising at least one processor and a transceiver connected to the at least one processor, wherein

• the at least one processor is configured to process a message received or transmitted by the transceiver;
• and
• the transceiver is configured to:
• receive a command message sent by a source base station, wherein the command message carries a granted resource that is allocated by a target base station to the user equipment, wherein the command message further carries a maximum quantity of transmission times that is configured for the granted resource by the target base station, and wherein a value of the maximum quantity of transmission times is set to 1;
• send a radio resource control (RRC) connection reconfiguration complete message to the target base station on the granted resource, wherein the RRC connection reconfiguration complete message is used to indicate to the target base station that the user equipment is successfully handed over to, dual-linked to, or multi-linked to the target base station;
• and
• after sending the RRC connection reconfiguration complete message to the target base station on the granted resource, initiate a random access process to the target base station when the configured maximum quantity of transmission times for the granted resource is reached and the user equipment receives a negative feedback message indicating that signaling transmission on the granted resource fails.