Inter-cell handover method of train-ground communication based on cooperative multipoint transmission in high-speed mobile environment

Abstract

The invention provides an inter-cell handover method of train-ground communication based on cooperative multipoint transmission in a high-speed mobile environment, which is applicable to an LTE (Long Term Evolution) and an evolution system of the LTE. The method mainly comprises the following steps of: judging whether a train enters into an overlay region according to reported real-time speed information and position information of the train; meanwhile, judging whether the quality of current signals is lower than a pre-set threshold value according to measurement information; if any condition is satisfied, activating the cooperative multipoint transmission (CoMP) between a current base station and a front target base station; sharing downlink data on a data surface of a vehicle-mounted platform between the adjacent two base stations through the CoMP technology and then sending the data to the vehicle-mounted platform; converging uplink data on the data surface of the vehicle-mounted platform through the CoMP technology into a source base station through a communication link of the adjacent two base stations; in the process, if a handover triggering condition is satisfied, handing over data of a control plane into the target base station. The method provided by the invention has the advantages of high handover success rate, low outage probability and high frequency spectrum utilization rate and does not need to change the base station and the vehicle-mounted platform, so that the method is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of vehicle-ground communication between a train and a ground base station in a high-speed mobile environment. Background technique [0002] With the continuous growth of high-speed train control and high-reliability data service transmission and the continuous growth of passenger demand for high-speed communication services during the ride, how to provide high-speed, high-reliability communication services in the high-mobility environment of high-speed railways is of great significance . [0003] The high-speed operation of trains has brought a series of technical problems to the train-ground wireless communication system: frequent handovers, Doppler frequency shifts, and rapid channel changes. These problems will lead to a serious decline in communication quality and communication experience. Among them, the handover of high-speed trains is one of the most important factors affecting the communication qual...

AI Technical Summary

Problems solved by technology

[0003] The high-speed operation of trains has brought a series of technical problems to the train-ground wireless communication system: frequent handovers, Doppler frequency shifts, and rapid channel changes, etc., all of which will lead to a serious decline in communication quality and communication experience

However, it is impossible to expand the coverage of the cell on a large scale due to the limitation of the size of the antenna transmission power, the reception limitation of the antenna transmission power caused by the radiation angle, the synchronization limitation caused by the time difference caused by the distance, etc.

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