Aiming at the requirements of frequent
cell handover, short
handover time and high
handover success rate in high-speed railway TD-LTE communication
system, a
fast handover method of TD-LTE communication
system based on target
cell pre-carrying is proposed. According to the
train's running position, speed and direction, after the network planning is completed, a
list of neighboring cells is generated in advance, and the switching position of each switching zone is preset, that is, the
longitude and
latitude position information. Before the
train enters the overlapping area of switching between two cells , when the distance from entering the handover zone is a certain value L, the source
base station eNodeB determines and sends the pre-bearer information to the target
base station eNodeB according to the measurement report of the user terminal UE, and the target
base station eNodeB performs the evolution packet
system ( Evolved Packet
System (EPS) resources to bear the load, when the
train enters the handover zone, if the train meets the handover criteria, the train will be handed over from the source
cell to the target cell. Therefore, this method reduces the handover
delay and is beneficial to improve the handover success rate. The method can dynamically adjust the switching method according to the mobile speed of the UE, solve the problem of
fast switching in a high-speed mobile environment, reduce the number of communication drops, improve the success rate of switching, enhance the
service quality of high-speed
broadband mobile services, and promote high-speed railway trains. The development of domestic
multimedia broadband mobile Internet services meets the growing needs of passengers for mobile communication services.